BRAKE CONTROL (DIAGNOSTICS)
BC(diag)

BRAKE CONTROL (DIAGNOSTICS) > Basic Diagnostic Procedure
PROCEDURE

Remove foreign matter (dust, water, oil etc.) from the VDCCM&H/U connector during removal and installation.

1. CHECK PRE-INSPECTION.
1.

Ask the customer when and how the trouble occurred using the interview check list. BRAKE CONTROL (DIAGNOSTICS)>Check List for Interview

2.

Before performing diagnostics, check the component which might affect VDC or parking brake system problems. BRAKE CONTROL (DIAGNOSTICS)>General Description>INSPECTION

Is the check result OK?

2

Repair or replace each component.

2. CHECK INDICATION OF DTC.
1.

Turn the ignition switch to ON.

2.

Read the DTC of [Brake Control] using the Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

If the communication function of the Subaru Select Monitor cannot be executed properly, check the communication circuit. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure for Subaru Select Monitor Communication

Are any DTCs displayed?

Record the DTC, time stamp and freeze frame data. 4

3

3. PERFORM GENERAL DIAGNOSTICS.
1.

Perform the inspection by referring to “General Diagnostic Table”. BRAKE CONTROL (DIAGNOSTICS)>General Diagnostic Table>INSPECTION

2.

Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC of [Brake Control] using the Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

5.

Check that the DTC is not displayed.

Do the VDC warning light & VDC indicator light, VDC OFF indicator light and ABS warning light go off after starting the engine?

Do the electronic parking brake warning light and the electronic parking brake operation indicator light go off with the electronic parking brake disengaged?

Finish the diagnosis.

Check the combination meter circuit. BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>ABS WARNING LIGHT DOES NOT GO OFF BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>VDC WARNING LIGHT AND VDC INDICATOR LIGHT DO NOT GO OFF BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>VDC OFF INDICATOR LIGHT DOES NOT GO OFF BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>ELECTRONIC PARKING BRAKE INDICATOR LIGHT DO NOT GO OFF

4. PERFORM DIAGNOSIS.
1.

Refer to “Diagnostic Trouble Code (DTC)”.

For the DTC list, refer to “Diagnostic Trouble Code (DTC)”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2.

Repair or replace the cause of trouble.

3.

Using the Subaru Select Monitor, perform the clear memory of [Brake Control]. COMMON(diag)>Clear memory

4.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

5.

Read the DTC of [Brake Control] using the Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed?

Repeat step 4 until DTC is not shown.

Finish the diagnosis.

- To check harness for open or short circuits, shake the suspected trouble spot or connector.

- Refer to “Check List for Interview”. BRAKE CONTROL (DIAGNOSTICS)>Check List for Interview

BRAKE CONTROL (DIAGNOSTICS) > Check List for Interview
CHECK

Check the following item about the vehicle’s state.

1. STATE OF ABS WARNING LIGHT

ABS warning light illuminates. | Always Sometimes Only once Does not illuminate • When/How long does it illuminate?
Ignition key position | LOCK ACC ON (before starting engine) START ON (after starting engine, engine is running) ON (after starting engine, engine is at a standstill)
Timing | Immediately after turning the ignition switch to ON Immediately after turning the ignition switch to START
While accelerating | — | km/h
— | MPH
While driving at a constant speed | km/h | MPH
While decelerating | — | km/h
— | MPH
When turning to the right | Steering angle: | deg
Steering time: | Sec.
When turning to the left | Steering angle: | deg
Steering time: | Sec.
When other electrical parts are operating
• Part name: • Operating condition:

2. STATE OF VDC WARNING LIGHT & VDC INDICATOR LIGHT

VDC warning light & VDC indicator light illuminates. | Always Sometimes Only once Does not illuminate • When/How long does it illuminate?
Ignition key position | LOCK ACC ON (before starting engine) START ON (after starting engine, engine is running) ON (after starting engine, engine is at a standstill)
Timing | Immediately after turning the ignition switch to ON Immediately after turning the ignition switch to START
While accelerating | — | km/h
— | MPH
While driving at a constant speed | km/h | MPH
While decelerating | — | km/h
— | MPH
When turning to the right | Steering angle: | deg
Steering time: | Sec.
When turning to the left | Steering angle: | deg
Steering time: | Sec.
When other electrical parts are operating
• Part name: • Operating condition:

3. STATE OF VDC OFF INDICATOR LIGHT

VDC OFF indicator light illuminates. | Always Sometimes Only once Does not illuminate • When/How long does it illuminate?
Ignition key position | LOCK ACC ON (before starting engine) START ON (after starting engine, engine is running) ON (after starting engine, engine is at a standstill)
Timing | Immediately after turning the ignition switch to ON Immediately after turning the ignition switch to START
While accelerating | — | km/h
— | MPH
While driving at a constant speed | km/h | MPH
While decelerating | — | km/h
— | MPH
When turning to the right | Steering angle: | deg
Steering time: | Sec.
When turning to the left | Steering angle: | deg
Steering time: | Sec.
When other electrical parts are operating
• Part name: • Operating condition:

4. STATE OF BRAKE WARNING LIGHT

Brake warning light illuminates/goes off/blinks. | Always Sometimes Only once Does not illuminate Does not go off Blinks • When/How long does illuminate/go off/blink?
Ignition key position | LOCK ACC ON (before starting engine) START ON (after starting engine, engine is running) ON (after starting engine, engine is at a standstill)
Timing | Immediately after turning the ignition switch to ON Immediately after turning the ignition switch to START When the parking brake switch is pressed When the parking brake switch is pulled When the parking brake switch is pressed continually ( times) When the parking brake switch is pulled continually ( times)
While accelerating | — | km/h
— | MPH
While driving at a constant speed | km/h | MPH
While decelerating | — | km/h
— | MPH
When turning to the right | Steering angle: | deg
Steering time: | Sec.
When turning to the left | Steering angle: | deg
Steering time: | Sec.
When other electrical parts are operating
• Part name: • Operating condition:

5. CONDITION OF ELECTRONIC PARKING BRAKE OPERATION INDICATOR LIGHT

Electronic parking brake operation indicator light does not illuminate. | Always Sometimes Only once Illuminates • When/How long does it illuminate?
Ignition key position | LOCK ACC ON (before starting engine) START ON (after starting engine, engine is running) ON (after starting engine, engine is at a standstill)
Timing | Immediately after turning the ignition switch to ON Immediately after turning the ignition switch to START When the parking brake switch is pressed When the parking brake switch is pulled When the parking brake switch is pressed continually ( times) When the parking brake switch is pulled continually ( times)
While accelerating | — | km/h
— | MPH
While driving at a constant speed | km/h | MPH
While decelerating | — | km/h
— | MPH
When turning to the right | Steering angle: | deg
Steering time: | Sec.
When turning to the left | Steering angle: | deg
Steering time: | Sec.
When other electrical parts are operating
• Part name: • Operating condition:

6. ELECTRONIC PARKING BRAKE WARNING LIGHT CONDITION

Electronic parking brake warning light illuminates. | Always Sometimes Only once Does not illuminate • When/How long does it illuminate?
Ignition key position | LOCK ACC ON (before starting engine) START ON (after starting engine, engine is running) ON (after starting engine, engine is at a standstill)
Timing | Immediately after turning the ignition switch to ON Immediately after turning the ignition switch to START When the parking brake switch is pressed When the parking brake switch is pulled When the parking brake switch is pressed continually ( times) When the parking brake switch is pulled continually ( times)
While accelerating | — | km/h
— | MPH
While driving at a constant speed | km/h | MPH
While decelerating | — | km/h
— | MPH
When turning to the right | Steering angle: | deg
Steering time: | Sec.
When turning to the left | Steering angle: | deg
Steering time: | Sec.
When other electrical parts are operating
• Part name: • Operating condition:

7. CONDITIONS UNDER WHICH TROUBLE OCCURS

Environment | a) Weather | Fine Cloudy Rainy Snowy Other:
b) Ambient temperature | °C (°F)
c) Road | Inner city Suburbs Highway Local street Uphill Downhill Paved road Gravel road Muddy road Sandy place Straight road Sharp curve Gentle curve S-curve Road with a slope on both sides Other:
d) Road surface | Dry Wet Covered with fresh snow Covered with hardened snow Frozen slope Other:
Condition | a) Brakes | Deceleration: | G
Continuous / intermittent
b) Accelerator | Acceleration: | G
Continuous / intermittent
c) Vehicle speed | km/h | MPH
Advancing While accelerating While decelerating At low speed When turning Other:
d) Tire inflation pressure | Front RH tire: | kPa
Front LH tire: | kPa
Rear RH tire: | kPa
Rear LH tire: | kPa
e) Degree of wear | Front RH tire: | mm (in)
Front LH tire: | mm (in)
Rear RH tire: | mm (in)
Rear LH tire: | mm (in)
f) Steering wheel | Sharp turning Gentle turning Straight forward motion Gentle return Sharp return
g) Tire/Wheel size | Specified size Except specification ( )
h) Tire variation | Summer tire Studless tire (brand: 　　　)
i) Tire chain is attached: Yes / No
j) Using T-type tires: Yes / No
k) Condition of suspension alignment:
l) Load condition:
m) Repaired parts are used: Yes / No
• Contents:
n) Others:

BRAKE CONTROL (DIAGNOSTICS) > General Description
CAUTION
1. SRS AIRBAG SYSTEM

Airbag system wiring harness is routed near the ABS wheel speed sensor and VDCCM&H/U.

- Do not use electrical test equipment on wiring harness and connector circuits of the airbag system.

- Be careful not to damage the airbag system wiring harness when servicing the ABS wheel speed sensor and VDCCM&H/U.

BRAKE CONTROL (DIAGNOSTICS) > General Description
INSPECTION

Before performing diagnosis, check the following items which might affect VDC problems.

1. BATTERY

Check the battery. STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION

2. GROUND

Check the installation of the ground bolt for VDC.

3. BRAKE FLUID
1.

Check the brake fluid level.

2.

Check the brake fluid for leaks.

4. HYDRAULIC UNIT

Check the hydraulic unit.

- When using the brake tester VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>INSPECTION > CHECKING THE HYDRAULIC UNIT VDC OPERATION USING A PRESSURE GAUGE

- When not using the brake tester VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>INSPECTION > CHECKING THE HYDRAULIC UNIT ABS OPERATION BY PRESSURE GAUGE

5. BRAKE DRAG

Check for brake drag.

6. BRAKE PAD AND ROTOR

Check the brake pad and rotor.

- Front BRAKE>Front Brake Pad>INSPECTION BRAKE>Front Disc Rotor>INSPECTION

- Rear BRAKE>Rear Brake Pad>INSPECTION BRAKE>Rear Disc Rotor>INSPECTION

7. PARKING BRAKE ASSEMBLY

Check the parking brake assembly. PARKING BRAKE>General Description>COMPONENT

8. TIRES

Check the tire specifications, tire wear and air pressure. WHEEL AND TIRE SYSTEM>General Description>SPECIFICATION

BRAKE CONTROL (DIAGNOSTICS) > General Description
PREPARATION TOOL
1. SPECIAL TOOL

ILLUSTRATION | TOOL NUMBER | DESCRIPTION | REMARKS
| — | SUBARU SELECT MONITOR 4 | Used for setting of each function and troubleshooting for electrical system. For detailed operation procedures of Subaru Select Monitor 4, refer to “Help” of application.

2. GENERAL TOOL

TOOL NAME | REMARKS
Circuit tester | Used for measuring resistance, voltage and current.
Oscilloscope | Used for measuring the sensor.
DST-i | Used together with Subaru Select Monitor 4.

BRAKE CONTROL (DIAGNOSTICS) > General Description
SYSTEM BLOCK DIAGRAM
BRAKE CONTROL (DIAGNOSTICS) > Electrical Component Location
LOCATION

(1) | VDC control module and hydraulic control unit (VDCCM&H/U) | (3) | Transmission control module (TCM) | (5) | ABS wheel speed sensor
(2) | Stop light relay | (4) | Engine control module (ECM) | (6) | Magnetic encoder

(1) | VDC OFF switch (model with high grade X mode, model without X mode) | (3) | Stop light and brake switch | (5) | AVH switch
(2) | Steering angle sensor | (4) | Electronic parking brake switch |  |

For models with standard X mode, VDC OFF switch is integrated with X mode switch.

BRAKE CONTROL (DIAGNOSTICS) > Control Module I/O Signal
ELECTRICAL SPECIFICATION

- Terminal numbers in VDCCM&H/U connector (on the control module side) are shown in the figure.

- When the connector is removed from the VDCCM&H/U, the brake warning light (EBD warning light), ABS warning light, VDC warning light & VDC operation indicator light and VDC OFF indicator light illuminate.

Terminal No. | Contents | Measuring condition | Standard
(B310) No. 1 ←→ Chassis ground | VDC pump motor power supply | Always | Battery voltage
(B310) No. 2 | RH rear brake caliper (+) | — | —
(B310) No. 3 | RH rear brake caliper (−) | — | —
(B310) No. 5 | CAN-H | — | —
(B310) No. 7 | FL wheel speed sensor GND | — | —
(B310) No. 8 ←→ Chassis ground | Electronic parking brake indicator light | Always | Battery voltage
(B310) No. 12 | LH rear brake caliper (−) | — | —
(B310) No. 13 | LH rear brake caliper (+) | — | —
(B310) No. 14 | Ground | — | —
(B310) No. 15 | Electronic parking brake switch | — | —
(B310) No. 16 | Electronic parking brake switch | — | —
(B310) No. 19 | CAN-L | — | —
(B310) No. 20 ←→ Chassis ground | Brake booster pressure sensor power supply | Ignition switch: ON | 4.85 — 5.15 V
(B310) No. 21 | FR wheel speed sensor signal | — | —
(B310) No. 22 | RR wheel speed sensor signal | — | —
(B310) No. 23 | RL wheel speed sensor GND | — | —
(B310) No. 24 | FL wheel speed sensor signal | — | —
(B310) No. 26 | FR wheel speed sensor GND | — | —
(B310) No. 27 ←→ Chassis ground | Brake fluid level switch | Ignition switch: ON | 6 V or more
(B310) No. 28 | Brake booster pressure sensor GND | — | —
(B310) No. 30 ←→ Chassis ground | VDCCM power supply | Always | Battery voltage
(B310) No. 31 | Electronic parking brake switch | — | —
(B310) No. 32 | Electronic parking brake switch | — | —
(B310) No. 33 ←→ Chassis ground | Stop light switch output | Ignition switch: ON | Ignition power supply voltage
(B310) No. 35 | VSO PIN output | — | —
(B310) No. 36 ←→ Chassis ground | Ignition power supply | Ignition switch: ON | Ignition power supply voltage
(B310) No. 37 | RR wheel speed sensor GND | — | —
(B310) No. 38 ←→ Chassis ground | Stop light switch | Brake pedal operation | Brake ON: Battery voltage Brake OFF: Ground
(B310) No. 39 | RL wheel speed sensor signal | — | —
(B310) No. 41 ←→ Chassis ground | VDC OFF switch (model with high grade X mode) | VDC OFF switch operation | Switch ON: 1 Ω or less Switch OFF: 1 MΩ or more
(B310) No. 43 ←→ Chassis ground | AVH switch | AVH switch operation | Ignition power supply voltage
(B310) No. 45 | Brake booster pressure sensor output signal | — | —
(B310) No. 46 | Ground | — | —

BRAKE CONTROL (DIAGNOSTICS) > Inspection Mode
PROCEDURE
1. VDC SYSTEM
1.

Clear the memory. COMMON(diag)>Clear memory

2.

Drive the vehicle at least ten minutes. (Reproduce nearly the same condition as occurred when the DTC was recorded.)

Make sure the vehicle is not dragged to one side under usual driving condition.

2. ELECTRONIC PARKING BRAKE SYSTEM
1.

Start the engine, and operate and release the electronic parking brake a few times with the vehicle at a standstill.

2.

Check if the warning light illuminates or blinks, or DTC is displayed.

If the DTC is displayed, perform the diagnosis using “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)

3.

Drive the vehicle at least 10 minutes, and operate and release the electronic parking brake a few times.

Do not drive the vehicle with the warning light illuminated or blinked.

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
INSPECTION

(1) | Brake warning light (EBD warning light) | (4) | VDC OFF indicator light | (7) | AVH ON indicator light
(2) | ABS warning light | (5) | Electronic parking brake warning light/vacuum system warning light | (8) | AVH operation indicator light
(3) | VDC warning light & VDC indicator light | (6) | Electronic parking brake operation indicator light |  |

(1) | Ignition switch | (7) | VDC OFF indicator light | (12) | VDC warning light & VDC indicator light
(2) | OFF | (8) | Electronic parking brake warning light | (13) | 2 seconds or more
(3) | ON | (9) | Light OFF | (14) | Electronic parking brake operation indicator light
(4) | Engine start | (10) | Light ON | (15) | Parking brake
(5) | ABS warning light | (11) | 2 seconds | (16) | Released
(6) | Brake warning light (EBD warning light) |  |  |  |

- The AVH ON indicator light illuminates/goes off when the AVH switch is operated with the ignition switch ON or after the engine is started.

- The AVH operation indicator light illuminates when the AVH is activated, and goes off when the AVH is deactivated.

1.

When warning lights or indicator lights do not illuminate in accordance with this illumination pattern, there must be an electrical malfunction.

2.

When the warning lights or indicator lights remain constantly OFF, check the combination meter circuit. BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>EBD WARNING LIGHT, ABS WARNING, VDC OFF INDICATOR LIGHT, VDC WARNING LIGHT AND VDC INDICATOR LIGHT DO NOT COME ON BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>ELECTRONIC PARKING BRAKE INDICATOR LIGHT DO NOT COME ON

3.

When the ABS warning light, VDC OFF indicator light, VDC warning light & VDC indicator light and electronic parking brake operation indicator light do not go off, check the combination meter circuit or CAN communication circuit. BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>ABS WARNING LIGHT DOES NOT GO OFF BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>VDC OFF INDICATOR LIGHT DOES NOT GO OFF BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>VDC WARNING LIGHT AND VDC INDICATOR LIGHT DO NOT GO OFF BRAKE CONTROL (DIAGNOSTICS)>Warning Light Illumination Pattern>ELECTRONIC PARKING BRAKE INDICATOR LIGHT DO NOT GO OFF

- Even when the ABS warning light and the VDC warning light & VDC indicator light do not go off in 2 seconds after illuminating, the ABS and VDC functions are normal if the warning lights go off while the vehicle is driven. However, while these lights are on, the functions with their warning lights illuminated do not operate.

- It may take several minutes before the VDC warning light & VDC indicator light goes off, if the vehicle is parked under low temperature for a specified time. This is not defective because it is resulted from low engine coolant temperature. Perform the Clear Memory Mode because DTC may be recorded at this time. COMMON(diag)>Clear memory

- With the vehicle jack-up/lift-up or set on free rollers, when the wheels lock or spin after starting the engine, ABS warning light, and VDC warning light & VDC indicator light may illuminate because VDCCM&H/U detects the abnormal conditions from ABS wheel speed sensor or longitudinal G sensor. In this case, this is not a malfunction. Clear the memory. COMMON(diag)>Clear memory

- When operation and release of the electronic parking brake is repeated excessively, the electronic parking brake warning light may illuminate or the electronic parking brake operation indicator light may blink and then the parking brake switch operation may not be accepted; this is not malfunction.

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
EBD WARNING LIGHT, ABS WARNING, VDC OFF INDICATOR LIGHT, VDC WARNING LIGHT AND VDC INDICATOR LIGHT DO NOT COME ON

Detecting condition:

Defective combination meter

Trouble symptom:

When the ignition switch is turned to ON (engine OFF), brake warning light (EBD warning light), ABS warning light, VDC OFF indicator light, and VDC warning light & VDC indicator light do not illuminate.

When pressing the VDC OFF switch for 30 seconds or more, the VDC OFF indicator light goes off and cannot operate any more. When turning the ignition switch from OFF to ON, the OFF operation enabled status is restored.

1. CHECK OTHER INDICATOR LIGHT.

Turn the ignition switch to ON.

Immediately after the ignition switch is turned to ON, do all the indicator lights for VDC system and others illuminate?

2

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

2. CHECK VDCCM.

Using the Subaru Select Monitor and while the engine is not running, display the [EBD Warning Light] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Immediately after the ignition switch is turned to ON, is the [EBD Warning Light] ON?

3

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

3. CHECK VDCCM.

Using the Subaru Select Monitor and while the engine is not running, display the [ABS Warning Lamp] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Immediately after the ignition switch is turned to ON, is the [ABS Warning Lamp] ON?

4

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

4. CHECK VDCCM.

Using the Subaru Select Monitor and while the engine is not running, display the [VDC-OFF Light] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Immediately after the ignition switch is turned to ON, is the [VDC-OFF Light] ON?

5

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

5. CHECK VDCCM.

Using the Subaru Select Monitor and while the engine is not running, display the [VDC Warning Lamp] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Immediately after the ignition switch is turned to ON, is the [VDC Warning Lamp] ON?

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
ELECTRONIC PARKING BRAKE INDICATOR LIGHT DO NOT COME ON

Detecting condition:

Defective combination meter

Trouble symptom:

When the ignition switch is ON (engine OFF), the electronic parking brake operation indicator light does not illuminate even when the electronic parking brake switch is operated.

1. CHECK OTHER INDICATOR LIGHT.

Turn the ignition switch to ON. (Engine OFF)

Do other indicator lights illuminate?

2

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

2. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

3

3. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

4

Perform the diagnosis for LAN system.

4. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
AVH ON INDICATOR LIGHT DO NOT COME ON

Detecting condition:

- Defective combination meter

- Defective AVH switch

Trouble symptom:

When the ignition switch is ON, the AVH ON indicator light does not illuminate even when the AVH switch is operated.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

When pressing the AVH switch for 30 seconds or more, AVH ON indicator light goes off and subsequent switch operations are not accepted. When turning the ignition switch from OFF to ON again, the ON/OFF operation enabled status is restored.

1. CHECK POWER SUPPLY OF AVH SWITCH.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the AVH switch.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between the AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 3 (+) — Chassis ground (−):

WITH CONSOLE CODE

(AD67) No. 3 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair the power supply circuit of AVH switch.

2. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance between VDCCM&H/U and AVH switch connector.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 — (B310) No. 43:

WITH CONSOLE CODE

(AD67) No. 8 — (B310) No. 43:

Is the resistance less than 1 Ω?

3

Repair harness and connector between VDCCM&H/U and AVH switch connector.

3. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 — Chassis ground:

WITH CONSOLE CODE

(AD67) No. 8 — Chassis ground:

Is the resistance 1 MΩ or more?

4

Repair ground short of harness between VDCCM&H/U and AVH switch connector.

4. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between the AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 (+) — Chassis ground (−):

WITH CONSOLE CODE

(AD67) No. 8 (+) — Chassis ground (−):

Is the voltage less than 1 V?

5

Repair short to power supply of harness between VDCCM&H/U and AVH switch connector.

5. CHECK AVH SWITCH.

Check the AVH switch. VEHICLE DYNAMICS CONTROL (VDC)>Auto Vehicle Hold Switch>INSPECTION

Is the check result OK?

6

Replace the AVH switch. VEHICLE DYNAMICS CONTROL (VDC)>Auto Vehicle Hold Switch

6. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
ELECTRONIC PARKING BRAKE INDICATOR LIGHT IS BLINKING

Detecting condition:

- When VDCCM&H/U was replaced

- When fault was detected or electronic parking brake switch was operated under faulty condition

- When electronic parking brake switch was operated during maintenance mode

- When electronic parking brake was operated while the vehicle was running on the free roller or while the tires were rotating with a help of the free roller

- When electronic parking brake was operated with the brake high in temperature or operated on a steep slope

Trouble symptom:

Electronic parking brake may not operate properly.

1. CHECK VDCCM&H/U.

If VDCCM&H/U was not replaced, start the diagnosis from step 2.

Was electronic parking brake operated after replacement of VDCCM&H/U?

2

It is normal if the electronic parking brake operation indicator light comes on by operating the electronic parking brake and goes off by disengaging.

2. CHECK ELECTRONIC PARKING BRAKE WARNING LIGHT.

Turn the ignition switch to ON. (Engine OFF)

Does electronic parking brake warning light illuminate?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

3

3. CHECK VEHICLE CONDITION.

Is the brake condition other than overheating?

Is the electronic parking brake is operated except on a steep road?

Normal.

4

4. CHECK DRIVING CONDITION.

Was the vehicle running except on the free roller?

Normal.

5

5. CHECK OPERATION OF ELECTRONIC PARKING BRAKE.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

Does electronic parking brake operation indicator light blink?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Electronic parking brake was temporarily prohibited.

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
AVH ON INDICATOR LIGHT COME ON

Detecting condition:

- Defective combination meter

- Defective CAN communication

- Defective AVH switch

Trouble symptom:

When the ignition switch is turned to ON, the AVH ON indicator light illuminates with the AVH switch not operated.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

1. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

3

Perform the diagnosis for LAN system.

3. CHECK POWER SUPPLY OF AVH SWITCH.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the AVH switch.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between the AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 3 (+) — Chassis ground (−):

WITH CONSOLE CODE

(AD67) No. 3 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

4

Repair the power supply circuit of AVH switch.

4. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance between VDCCM&H/U and AVH switch connector.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 — (B310) No. 43:

WITH CONSOLE CODE

(AD67) No. 8 — (B310) No. 43:

Is the resistance less than 1 Ω?

5

Repair harness and connector between VDCCM&H/U and AVH switch connector.

5. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 — Chassis ground:

WITH CONSOLE CODE

(AD67) No. 8 — Chassis ground:

Is the resistance 1 MΩ or more?

6

Repair ground short of harness between VDCCM&H/U and AVH switch connector.

6. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between the AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 (+) — Chassis ground (−):

WITH CONSOLE CODE

(AD67) No. 8 (+) — Chassis ground (−):

Is the voltage less than 1 V?

7

Repair short to power supply of harness between VDCCM&H/U and AVH switch connector.

7. CHECK AVH SWITCH.

Check the AVH switch. VEHICLE DYNAMICS CONTROL (VDC)>Auto Vehicle Hold Switch>INSPECTION

Is the check result OK?

8

Replace the AVH switch. VEHICLE DYNAMICS CONTROL (VDC)>Auto Vehicle Hold Switch

8. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
AVH OPERATION INDICATOR LIGHT COME ON

Detecting condition:

Defective combination meter

Trouble symptom:

When the ignition switch is ON, the AVH operation indicator light illuminates.

- When the ignition switch is turned to OFF and turned to ON again, the AVH function becomes OFF.

- The AVH operation indicator light and the AVH ON indicator light do not illuminate immediately after the ignition switch is turned to ON.

1. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

3

Perform the diagnosis for LAN system.

3. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
ABS WARNING LIGHT DOES NOT GO OFF

Detecting condition:

- Defective combination meter

- Defective engine

- Defective CAN communication

Trouble symptom:

ABS warning light does not go off when starting the engine.

1. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK VDCCM.

Using Subaru Select Monitor, display [ABS Warning Lamp] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is [ABS Warning Lamp] ON?

3

5

3. CHECK WARNING LIGHT.
1.

Save the freeze frame data. BRAKE CONTROL (DIAGNOSTICS)>Freeze Frame Data

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

Does the ABS warning light go off?

Normal. Perform the inspection mode to check that the light does not turn ON again.

4

4. READ DTC.

After driving the vehicle at 40 km/h (25 MPH) or more, read DTCs using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

5

5. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

6

Perform the diagnosis for LAN system.

6. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter>REMOVAL

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
VDC WARNING LIGHT AND VDC INDICATOR LIGHT DO NOT GO OFF

Detecting condition:

- Defective combination meter

- Defective engine

- Defective CAN communication

Trouble symptom:

VDC warning light and VDC indicator light do not go off when starting the engine.

1. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK VDCCM.

Using Subaru Select Monitor, display [VDC Warning Lamp] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is [VDC Warning Lamp] ON?

3

5

3. CHECK WARNING LIGHT.
1.

Save the freeze frame data. BRAKE CONTROL (DIAGNOSTICS)>Freeze Frame Data

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

Does the VDC warning light & VDC operation indicator light go off?

Normal. Perform the inspection mode to check that the light does not turn ON again.

4

4. READ DTC.

After driving the vehicle at 40 km/h (25 MPH) or more, read DTCs using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

5

5. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

6

Perform the diagnosis for LAN system.

6. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter>REMOVAL

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
ELECTRONIC PARKING BRAKE INDICATOR LIGHT DO NOT GO OFF

Detecting condition:

Defective combination meter

Trouble symptom:

When starting the engine, the electronic parking brake operation indicator light does not go off.

1. CHECK INDICATOR LIGHT.
1.

Start the engine.

2.

Operate the electronic parking brake switch.

Does electronic parking brake operation indicator light go off?

Normal.

2

2. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

3

3. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

4

Perform the diagnosis for LAN system.

4. CHECK VDCCM&H/U.

Using the Subaru Select Monitor and while the engine is running, display the [Parking System Warning Light] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is [Parking System Warning Light] ON?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

5

5. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
VDC OFF INDICATOR LIGHT DOES NOT GO OFF

Detecting condition:

- Defective combination meter

- Defective CAN communication

- VDC OFF switch is shorted.

Trouble symptom:

VDC OFF indicator light does not go off when starting the engine.

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

- This diagnosis is applied to models with high grade X mode and models without X mode.

- VDC OFF indicator light illuminates when X mode is “D.SNOW/MUD”.

1. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK VDC OFF SWITCH.

Using the Subaru Select Monitor and while the engine is running, display the [OFF SW Signal] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Does [OFF SW Signal] change according to operation of VDC OFF switch?

5

3

3. CHECK VDC OFF SWITCH.

Remove and check VDC OFF switch. VEHICLE DYNAMICS CONTROL (VDC)>VDC OFF Switch

Is the check result OK?

4

Replace the VDC OFF switch.

4. CHECK VDC OFF SWITCH CIRCUIT.
1.

Disconnect the connector from the VDCCM&H/U.

2.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 41 — Chassis ground:

Is the resistance less than 10 Ω?

Check the VDC OFF switch circuit.

5

5. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

6

Perform the diagnosis for LAN system.

6. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter>REMOVAL

BRAKE CONTROL (DIAGNOSTICS) > Warning Light Illumination Pattern
BRAKE WARNING LIGHT DOES NOT GO OFF

Detecting condition:

- Brake warning light circuit is shorted.

- Defective sensor/connector

- Defective CAN communication

Trouble symptom:

Brake warning light does not go off after starting the engine.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

Combination meter system WIRING SYSTEM>Combination Meter System

1. CHECK INSTALLATION OF VDCCM&H/U CONNECTOR.
1.

Turn the ignition switch to OFF.

2.

Check that the VDCCM&H/U connector is inserted until it is locked by clamp.

Is the connector firmly inserted?

2

Insert the VDCCM&H/U connector until it is locked by clamp.

2. READ DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

3

3. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

4

Perform the diagnosis for LAN system.

4. CHECK BRAKE FLUID AMOUNT.

Check the amount of brake fluid in the reservoir tank of master cylinder.

Does the level of the brake fluid amount fall between the lines of “MAX” and “MIN”?

5

Replenish brake fluid to the specified value.

5. CHECK BRAKE FLUID LEVEL SWITCH.
1.

Turn the ignition switch to OFF.

2.

Disconnect the level switch connector (B16) from master cylinder.

3.

Measure the resistance of master cylinder terminals.

Terminals

No. 1 — No. 2:

Is the resistance 1 MΩ or more?

6

Replace the master cylinder. BRAKE>Master Cylinder

6. CHECK GROUND SHORT OF HARNESS.
1.

Disconnect the connector from VDCCM.

2.

Measure the resistance between VDCCM connector and chassis ground.

Connector & terminal

(B310) No. 27 — Chassis ground:

Is the resistance 1 MΩ or more?

7

Repair the harness between VDCCM and brake fluid level switch.

7. CHECK COMBINATION METER.

Check the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION > SELF-DIAGNOSIS DISPLAY MODE

Is the check result OK?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the combination meter. INSTRUMENTATION/DRIVER INFO>Combination Meter

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure for Subaru Select Monitor Communication
INSPECTION

Detecting condition:

Defective harness connector

Trouble symptom:

Communication is impossible between VDC and Subaru Select Monitor.

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK IGNITION SWITCH.

Is the ignition switch ON?

2

Turn the ignition switch to ON, and select the [Brake Control] using the Subaru Select Monitor.

2. CHECK BATTERY.
1.

Turn the ignition switch to OFF.

2.

Measure the battery voltage.

Is the voltage 11 V or more?

3

Charge or replace the battery.

3. CHECK BATTERY TERMINAL.

Is there poor contact at battery terminal?

Replace or tighten the battery terminal.

4

4. CHECK INSTALLATION OF VDCCM&H/U CONNECTOR.

Turn the ignition switch to OFF.

Is the VDCCM&H/U connector inserted into VDCCM&H/U until the clamp locks onto it?

5

Insert VDCCM&H/U connector into VDCCM&H/U.

5. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

6

Perform the diagnosis for LAN system.

6. CHECK SUBARU SELECT MONITOR COMMUNICATION.
1.

Turn the ignition switch to ON.

2.

Check whether communication to VDC system can be executed normally.

Is the [Select Function] screen displayed?

Check the DTC in VDC system. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

7

7. CHECK SUBARU SELECT MONITOR COMMUNICATION.

Connect the Subaru Select Monitor to another vehicle to check whether the communication for initializing can be executed normally.

Does the Subaru Select Monitor communicate normally?

8

Repair or replace the Subaru Select Monitor.

8. CHECK POWER SUPPLY CIRCUIT.
1.

Turn the ignition switch to ON. (Engine OFF)

2.

Measure the ignition power supply voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 1 (+) — Chassis ground (−):

(B310) No. 30 (+) — Chassis ground (−):

(B310) No. 36 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

9

Repair open circuit in harness between VDCCM&H/U and battery.

9. CHECK HARNESS CONNECTOR BETWEEN VDCCM&H/U AND CHASSIS GROUND.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance of harness between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 14 — Chassis ground:

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

10

Repair the open circuit of VDCCM&H/U ground circuit and poor contact of connector.

10. CHECK POOR CONTACT OF CONNECTOR.

Is there poor contact of control module power supply, ground circuit and data link connector?

Repair the connector.

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

BRAKE CONTROL (DIAGNOSTICS) > Data Monitor
OPERATION

- For detailed operation procedures, refer to “Common (Diagnostics)”. COMMON(diag)>Diagnostic Trouble Code (DTC)

- For details on the data monitor, refer to the list. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor>LIST

BRAKE CONTROL (DIAGNOSTICS) > Data Monitor
LIST

Item | Contents | Standard/Unit | Note
Trip Count | Total number of ignition switch ON | Time | —
Count | Counter | - | —
Time Count | Elapsed time after ignition switch is turned to ON | ms | —
FR Wheel Speed | Wheel speed detected by front ABS wheel speed sensor RH | km/h | —
FL Wheel Speed | Wheel speed detected by front ABS wheel speed sensor LH | km/h | —
RR Wheel Speed | Wheel speed detected by rear ABS wheel speed sensor RH | km/h | —
RL Wheel Speed | Wheel speed detected by rear ABS wheel speed sensor LH | km/h | —
Steering Angle Sensor | Steering angle detected by steering angle sensor | deg | —
Yaw Rate Sensor | Angle of the vehicle detected by yaw rate sensor | deg/s | —
Pressure Sensor Output | Brake fluid pressure detected by pressure sensor | bar | —
Longitudinal G Sensor | Vehicle longitudinal acceleration detected by longitudinal G sensor | m/s^2 | —
Lateral G Sensor | Vehicle lateral acceleration detected by lateral G sensor | m/s^2 | —
Voltage of IGN | Voltage supplied to VDCCM&H/U | V | —
M. Relay monitor Voltage | Voltage applied to the motor relay | V | —
FL wheel cylinder pressure sensor output | FL wheel cylinder brake fluid pressure detected by pressure sensor (model with EyeSight) | bar | —
FR wheel cylinder pressure sensor output | FR wheel cylinder brake fluid pressure detected by pressure sensor (model with EyeSight) | bar | —
Eyesight Request Pressure | Requested fluid pressure when braking command is sent from EyeSight to VDC (model with EyeSight) | MPa | —
Brake Booster Gauge Sensor Output | Vacuum pressure value inside brake booster measured by VDC (difference from atmospheric pressure) | kPa | —
Motor Relay Signal | Motor relay drive signal | ON or OFF | —
Valve Relay Signal | Valve relay drive signal | ON or OFF | —
EBD Warning Light | Signal for ON operation (illumination) of EBD warning light | ON or OFF | —
ABS Warning Lamp | Signal for ON operation (illumination) of ABS warning light | ON or OFF | —
VDC Warning Lamp | Signal for ON operation (illumination) of VDC warning light | ON or OFF | —
EBD Control Flag | Flag of EBD control activation status | ON or OFF | —
ABS Control Flag | Flag of ABS control activation status | ON or OFF | —
TCS Control Flag | Flag of TCS control activation status | ON or OFF | —
VDC Control Flag | Flag of VDC control activation status | ON or OFF | —
E/G Torque Down Control Stop Flag | Flag of engine control command signal | 1 or 0 | —
Stop-lamp relay drive signal | Brake light relay drive signal | ON or OFF | —
X Mode | X mode status (model with X mode) | ON or OFF | —
E/G torques up Control Stop Flag | Flag of engine control command signal | 1 or 0 | —
Brake Negative Pressure Warning | Signal for illuminating warning light for brake vacuum pressure fault | 1 or 0 | —
OHB Control Flag | Flag of OHB∗ control activation status | 1 or 0 | —
OHB Operation Number | Number of OHB∗ control activation time | Time | —
Hill Descent Control State | Hill descent control operation status (model with hill descent control) | OFF, Standby, Active or Unstable | —
Vectoring Control Flag | Activation status flag of brake-based torque vectoring control | ON or OFF | —
Brake Fluid Level Warning Lamp | Signal for illuminating brake fluid level warning light | ON or OFF | —
VDC-OFF Light | ON/OFF status of VDC OFF indicator light | ON or OFF | —
OFF SW Signal | Operation status of VDC OFF switch | ON or OFF | —
Brake Light Switch | Brake ON/OFF status | ON or OFF | —
Reverse Signal | Reverse gear ON/OFF status | ON or OFF | —
Fluid Switch State | Recognition status of fluid level switch | ON or OFF | —
Incline | Incline of the vehicle | % | —
Total Operation Number | Total number of the electronic parking brake operation | Time | —
Auto Operation Number | Number of times that the electronic parking brake operated automatically while using the adaptive cruise control is displayed | Time | —
Auto Cancel Number | Number of times that the automatic accelerator interlock cancel function operated at starting | Time | —
Parking Operation Number when driving | Total number of the electronic parking brake operation while driving | Time | —
Engine Torque | Engine torque | Nm | —
Ambient Temp Sensor | Ambient temperature | °C | —
Auto Vehicle Hold Operation Number | Number of times that the AVH function is activated | Time | —
Manual Parking Operation | Operation status of parking brake | ON or OFF | —
Auto Parking Operation | Operation status of parking brake | ON or OFF | —
Parking Operation when driving | Operation status of parking brake | ON or OFF | —
Parking Cancel | Operation status of parking brake | ON or OFF | —
Ignition Signal | Input condition of ignition signal | ON or OFF | —
Parking System Warning Light | Control condition of electric parking brake warning light | ON or OFF | —
Neutral Signal | Input condition of neutral signal | ON or OFF | —
Reverse Signal | Input condition of reverse signal | ON or OFF | —
Engine idle flag | Engine running condition | ON or OFF | —
Door Signal | Input condition of door (4 locations) open/close signal | ON or OFF | —
Driver Seat Belt Signal | Input condition of driver’s seat belt buckle signal | ON or OFF | —
Auto Vehicle Hold ON Lamp | ON/OFF status of AVH ON indicator light | ON or OFF | —
EPB Operation Light | Electronic parking brake indicator light ON/OFF status | ON or OFF | —
EPB Switch Indicator | Lighting condition of electronic parking brake switch indicator light | ON or OFF | —
Auto Vehicle Hold Switch State | AVH switch ON/OFF status | ON or OFF | —

∗: OHB = Optimized Hydraulic Brake (brake assist function when vacuum pressure drops)

BRAKE CONTROL (DIAGNOSTICS) > Freeze Frame Data
OPERATION

- For detailed operation procedures, refer to “Common (Diagnostics)”. COMMON(diag)>Diagnostic Trouble Code (DTC)

- For details on freeze frame data, refer to the list. BRAKE CONTROL (DIAGNOSTICS)>Freeze Frame Data>LIST

BRAKE CONTROL (DIAGNOSTICS) > Freeze Frame Data
LIST

Item | Contents | Standard/Unit | Note
Trip Count | Total number of ignition switch ON | Time | —
Count | Counter | - | —
Time Count | Elapsed time after ignition switch is turned to ON | ms | —
FR Wheel Speed | Wheel speed detected by front ABS wheel speed sensor RH | km/h | —
FL Wheel Speed | Wheel speed detected by front ABS wheel speed sensor LH | km/h | —
RR Wheel Speed | Wheel speed detected by rear ABS wheel speed sensor RH | km/h | —
RL Wheel Speed | Wheel speed detected by rear ABS wheel speed sensor LH | km/h | —
Vehicle Speed | Vehicle speed | km/h | —
Steering Angle Sensor | Steering angle detected by steering angle sensor | deg | —
Yaw Rate Sensor | Angle of the vehicle detected by yaw rate sensor | deg/s | —
Pressure Sensor Output | Brake fluid pressure detected by pressure sensor | bar | —
Longitudinal G Sensor | Vehicle longitudinal acceleration detected by longitudinal G sensor | m/s^2 | —
Lateral G Sensor | Vehicle lateral acceleration detected by lateral G sensor | m/s^2 | —
Voltage of IGN | Voltage supplied to VDCCM&H/U | V | —
Acceleration Pedal Position | Accelerator pedal opening angle | % | —
Engine Speed | Engine speed | rpm | —
FL wheel cylinder pressure sensor output | FL wheel cylinder brake fluid pressure detected by pressure sensor (model with EyeSight) | bar | —
FR wheel cylinder pressure sensor output | FR wheel cylinder brake fluid pressure detected by pressure sensor (model with EyeSight) | bar | —
Eyesight Request Pressure | Requested fluid pressure when braking command is sent from EyeSight to VDC | MPa | —
Brake Booster Gauge Sensor Output | Vacuum pressure value inside brake booster measured by VDC (difference from atmospheric pressure) | kPa | —
Steering angle flag | Absolute angle status of steering angle sensor | Recognized or No recognition | —
EBD Control Flag | Flag of EBD control activation status | ON or OFF | —
ABS Control Flag | Flag of ABS control activation status | ON or OFF | —
TCS Control Flag | Flag of TCS control activation status | ON or OFF | —
VDC Control Flag | Flag of VDC control activation status | ON or OFF | —
E/G Torque Down Control Stop Flag | Flag of engine control command signal | 1 or 0 | —
Stop-lamp relay drive signal | Brake light relay drive signal | ON or OFF | —
X Mode | X mode status (model with X mode) | ON or OFF | —
E/G torques up Control Stop Flag | Flag of engine control command signal | 1 or 0 | —
Brake Negative Pressure Warning | Signal for illuminating warning light for brake vacuum pressure fault | 1 or 0 | —
OHB Control Flag | Flag of OHB∗ control activation status | 1 or 0 | —
OHB Operation Number | Number of OHB∗ control activation time | Time | —
Hill Descent Control State | Hill descent control operation status (model with hill descent control) | OFF, Standby, Active or Unstable | —
Vectoring Control Flag | Activation status flag of brake-based torque vectoring control | ON or OFF | —
VDC OFF Status | Operation status of VDC OFF switch | ON or OFF | —
Brake Light Switch | Brake ON/OFF status | ON or OFF | —
Reverse Signal | Reverse gear ON/OFF status | ON or OFF | —
Detailed DTC(s) | Further categorization of diagnosis code | - | —
Incline | Incline of the vehicle | % | —
Engine Torque | Engine torque | Nm | —
Ambient Temp Sensor | Ambient temperature | °C | —
Manual Parking Operation | Operation status of parking brake | ON or OFF | —
Auto Parking Operation | Operation status of parking brake | ON or OFF | —
Parking Operation when driving | Operation status of parking brake | ON or OFF | —
Parking Cancel | Operation status of parking brake | ON or OFF | —
Ignition Signal | Input condition of ignition signal | ON or OFF | —
Neutral Signal | Input condition of neutral signal | ON or OFF | —
Reverse Signal | Input condition of reverse signal | ON or OFF | —
Engine idle flag | Engine running condition | ON or OFF | —
Door Signal | Input condition of door (4 locations) open/close signal | ON or OFF | —
Driver Seat Belt Signal | Input condition of driver’s seat belt buckle signal | ON or OFF | —
Auto Vehicle Hold ON Lamp | ON/OFF status of AVH ON indicator light | ON or OFF | —
EPB Switch Signal | Recognition status of EPB switch | Neutral, Release, Apply or Unknown | —

∗: OHB = Optimized Hydraulic Brake (brake assist function when vacuum pressure drops)

BRAKE CONTROL (DIAGNOSTICS) > Work Support
OPERATION
1.

On [Start] display, select [Diagnosis].

2.

On [Vehicle selection] display, enter vehicle information and select [OK].

3.

On [Main Menu] display, select [Each System].

4.

On [Select System] display, select [Brake Control].

5.

On [Select Function] display, select [Work Support].

BRAKE CONTROL (DIAGNOSTICS) > Work Support
LIST

Work support item | Contents | Reference
ABS Sequence Control Mode | Operate the valve and pump motor continuously to perform the ABS sequence control. | VEHICLE DYNAMICS CONTROL (VDC)>ABS Sequence Control
VDC Function Check Mode | Operate the valve and pump motor continuously to perform the VDC sequence control. | VEHICLE DYNAMICS CONTROL (VDC)>VDC Sequence Control
Brake Lamp Lighting Operation | Forcibly activate the brake light relay to illuminate the brake light. | VEHICLE DYNAMICS CONTROL (VDC)>Brake Lamp Relay>OPERATION > BRAKE LIGHT LIGHTING OPERATION BY SUBARU SELECT MONITOR
VSC(VDC) Centering Mode | Set the steering angle sensor neutral position, and the lateral G sensor and longitudinal G sensor 0 (zero) point. | VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE
Reading of parameter: ECM to SSM | Read VDCCM parameter data. | VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER READING
Writing of parameter: SSM to ECM | Write the parameter data to the VDCCM. | VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER WRITING
Selection of Parameter | Select and register parameters in the VDCCM. | VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER SELECTION
Confirm on parameter | Parameters registered in the VDCCM are displayed. | VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER CHECK
Brake Maintenance Mode | Used when inspecting and repairing parts related to rear brake. | PARKING BRAKE>Parking Brake System>OPERATION > BRAKE MAINTENANCE MODE
Electric Parking Brake Compulsion Release Mode | Release the electronic parking brake forcibly. | PARKING BRAKE>Emergency Release of Electronic Parking Brake>OPERATION

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Trouble Code (DTC)
OPERATION

- For detailed operation procedures, refer to “Common (Diagnostics)”. COMMON(diag)>Diagnostic Trouble Code (DTC)

- For details on DTCs, refer to the list. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Trouble Code (DTC)
LIST

DTC | Item | Reference
C1211 | FRONT RIGHT ABS SENSOR CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1211 FRONT RIGHT ABS SENSOR CIRCUIT
C1212 | FRONT RIGHT ABS SENSOR SIGNAL | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1212 FRONT RIGHT ABS SENSOR SIGNAL
C1221 | FRONT LEFT ABS SENSOR CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1221 FRONT LEFT ABS SENSOR CIRCUIT
C1222 | FRONT LEFT ABS SENSOR SIGNAL | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1222 FRONT LEFT ABS SENSOR SIGNAL
C1231 | REAR RIGHT ABS SENSOR CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1231 REAR RIGHT ABS SENSOR CIRCUIT
C1232 | REAR RIGHT ABS SENSOR SIGNAL | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1232 REAR RIGHT ABS SENSOR SIGNAL
C1241 | REAR LEFT ABS SENSOR CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1241 REAR LEFT ABS SENSOR CIRCUIT
C1242 | REAR LEFT ABS SENSOR SIGNAL | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1242 REAR LEFT ABS SENSOR SIGNAL
C1251 | WHEEL SPEED SENSOR SYSTEM | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1251 WHEEL SPEED SENSOR SYSTEM
C1252 | WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS
C1311 | FR HOLD VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1311 FR HOLD VALVE
C1312 | FR PRESSURE REDUCING VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1312 FR PRESSURE REDUCING VALVE
C1321 | FL HOLD VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1321 FL HOLD VALVE
C1322 | FL PRESSURE REDUCING VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1322 FL PRESSURE REDUCING VALVE
C1331 | RR HOLD VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1331 RR HOLD VALVE
C1332 | RR PRESSURE REDUCING VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1332 RR PRESSURE REDUCING VALVE
C1341 | RL HOLD VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1341 RL HOLD VALVE
C1342 | RL PRESSURE REDUCING VALVE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1342 RL PRESSURE REDUCING VALVE
C1351 | NORMAL OPENING VALVE 1 | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1351 NORMAL OPENING VALVE 1
C1352 | NORMAL OPENING VALVE 2 | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1352 NORMAL OPENING VALVE 2
C1361 | NORMAL CLOSING VALVE 1 | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1361 NORMAL CLOSING VALVE 1
C1362 | NORMAL CLOSING VALVE 2 | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2
C1411 | ELECTRICAL CONTROL MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1411 ELECTRICAL CONTROL MODULE
C1412 | SELECTED PARAMETER | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1412 SELECTED PARAMETER
C1413 | POWER SUPPLY VOLTAGE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1413 POWER SUPPLY VOLTAGE
C1421 | ECM CONTROL SYSTEM | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1421 ECM CONTROL SYSTEM
C1422 | VDC INTERRUPTION FOR ENGINE CONVENIENCE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE
C1423 | DIFFERENT ECU SPECIFICATIONS | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1423 DIFFERENT ECU SPECIFICATIONS
C1424 | ECM | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1424 ECM
C1431 | AT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1431 AT
C1432 | DIFFERENT ECU SPECIFICATIONS | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1432 DIFFERENT ECU SPECIFICATIONS
C1441 | EYESIGHT REQUEST PRESSURE ABNORMAL | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1441 EyeSight REQUEST PRESSURE ABNORMAL
C1511 | VALVE RELAY | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1511 VALVE RELAY
C1512 | VALVE SYSTEM | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1512 VALVE SYSTEM
C1521 | MOTOR RELAY | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1521 MOTOR RELAY
C1531 | BLS OFF STUCK | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1531 BLS OFF STUCK
C1532 | BLS ON STUCK | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1532 BLS ON STUCK
C1571 | BRAKE LAMP RELAY OFF STUCK | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1571 BRAKE LAMP RELAY OFF STUCK
C1572 | BRAKE LAMP RELAY ON STUCK | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1572 BRAKE LAMP RELAY ON STUCK
C1581 | BRAKE BOOST NEGATIVE PRESSURE ABNORMAL | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1581 BRAKE BOOST NEGATIVE PRESSURE ABNORMAL
C1711 | STEERING ANGLE SENSOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1711 STEERING ANGLE SENSOR
C1721 | YAW RATE SENSOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1721 YAW RATE SENSOR
C1731 | G SENSOR FAILURE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1731 G SENSOR ABNORMAL
C1732 | LATERAL G SENSOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1732 LATERAL G SENSOR
C1733 | LONGITUDINAL G SENSOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1733 LONGITUDINAL G SENSOR
C1741 | PRESSURE SENSOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1741 PRESSURE SENSOR
C1742 | WHEEL CYLINDER PRESSURE SENSOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1742 WHEEL CYLINDER PRESSURE SENSOR
C1751 | BRAKE BOOST GAUGE SENSOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1751 BRAKE BOOST GAUGE SENSOR
C1811 | SYSTEM | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1811 SYSTEM
C1821 | BRAKE TEMPERATURE ABNORMAL | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1821 BRAKE TEMPERATURE ABNORMAL
C1831 | INSUFFICIENT DECELERATION DURING DYNAMIC PARKING BRAKE OPERATION | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1831 INSUFFICIENT DECELERATION DURING DYNAMIC PARKING BRAKE OPERATION
C1921 | PARKING POSITION SWITCH CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1921 PARKING POSITION SWITCH CIRCUIT
C1923 | AUTO VEHICLE HOLD SWITCH CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1923 AUTO VEHICLE HOLD SWITCH CIRCUIT
C1935 | IGNITION SWITCH CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1935 IGNITION SWITCH CIRCUIT
C1942 | POWER SUPPLY VOLTAGE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1942 POWER SUPPLY VOLTAGE
C1951 | ACTUATOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1951 ACTUATOR
C1954 | RH ACTUATOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1954 RH ACTUATOR
C1955 | LH ACTUATOR | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1955 LH ACTUATOR
C1956 | RH ACTUATOR CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1956 RH ACTUATOR CIRCUIT
C1957 | LH ACTUATOR CIRCUIT | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1957 LH ACTUATOR CIRCUIT
C1983 | HIGH FREQUENCY OPERATION | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1983 HIGH FREQUENCY OPERATION
C1984 | BRAKE MAINTENANCE MODE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1984 BRAKE MAINTENANCE MODE
C1985 | FORBIDDEN STATE OF DYNAMIC ACTUATOR OPERATION | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1985 FORBIDDEN STATE OF DYNAMIC ACTUATOR OPERATION
U0073 | CONTROL MODULE COMMUNICATION BUS OFF | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF
U0100 | LOST COMMUNICATION WITH ECM/PCM "A" | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A"
U0101 | LOST COMMUNICATION WITH TCM | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0101 LOST COMMUNICATION WITH TCM
U0126 | LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0126 LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE
U0140 | LOST COMMUNICATION WITH BODY CONTROL MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE
U0155 | LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE
U0401 | INVALID DATA RECEIVED FROM ECM/PCM "A" | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A"
U0402 | INVALID DATA RECEIVED FROM TCM | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0402 INVALID DATA RECEIVED FROM TCM
U0422 | INVALID DATA RECEIVED FROM BODY CONTROL MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE
U0423 | INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE
U0428 | INVALID DATA RECEIVED FROM STEERING ANGLE SENSOR MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0428 INVALID DATA RECEIVED FROM STEERING ANGLE SENSOR MODULE
U1120 | LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1120 LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE
U1235 | LOST COMMUNICATION WITH EyeSight | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1235 LOST COMMUNICATION WITH EyeSight
U1433 | INVALID DATA RECEIVED FROM EyeSight | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1433 INVALID DATA RECEIVED FROM EyeSight
U1469 | INVALID DATA RECEIVED FROM AUTOSTART STOP CONTROL MODULE | BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1469 INVALID DATA RECEIVED FROM AUTOSTART STOP CONTROL MODULE

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1211 FRONT RIGHT ABS SENSOR CIRCUIT

For the diagnostic procedure, refer to “DTC C1241 REAR LEFT ABS SENSOR CIRCUIT”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1241 REAR LEFT ABS SENSOR CIRCUIT

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1221 FRONT LEFT ABS SENSOR CIRCUIT

For the diagnostic procedure, refer to “DTC C1241 REAR LEFT ABS SENSOR CIRCUIT”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1241 REAR LEFT ABS SENSOR CIRCUIT

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1231 REAR RIGHT ABS SENSOR CIRCUIT

For the diagnostic procedure, refer to “DTC C1241 REAR LEFT ABS SENSOR CIRCUIT”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1241 REAR LEFT ABS SENSOR CIRCUIT

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1241 REAR LEFT ABS SENSOR CIRCUIT

DTC detecting condition:

Judge as malfunction when the current value of the wheel speed sensor is out of normal range for a predetermined time or more.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

This DTC may be stored when the wheel speed sensor connector is disconnected regardless of the ignition switch condition (ON/OFF). Perform the Clear Memory Mode after diagnosis if a DTC is recorded. COMMON(diag)>Clear memory

1. CHECK POOR CONTACT OF CONNECTOR.

Check if there is poor contact between VDCCM&H/U and ABS wheel speed sensor.

Is there poor contact?

Repair the connector.

2

2. CHECK HARNESS CONNECTOR BETWEEN VDCCM&H/U AND ABS WHEEL SPEED SENSOR (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector (B310) from the VDCCM&H/U.

3.

Disconnect the connector from ABS wheel speed sensor.

4.

Measure the resistance between VDCCM&H/U connector and ABS wheel speed sensor connector.

Connector & terminal

DTC C1211

(B310) No. 21 — (B6) No. 1:

(B310) No. 26 — (B6) No. 2:

DTC C1221

(B310) No. 24 — (B15) No. 1:

(B310) No. 7 — (B15) No. 2:

DTC C1231

(B310) No. 37 — (R72) No. 1:

(B310) No. 22 — (R72) No. 2:

DTC C1241

(B310) No. 23 — (R73) No. 1:

(B310) No. 39 — (R73) No. 2:

Is the resistance less than 1 Ω?

3

Repair the harness connector between VDCCM&H/U and ABS wheel speed sensor.

3. CHECK GROUND SHORT OF HARNESS.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

DTC C1211

(B310) No. 26 — Chassis ground:

DTC C1221

(B310) No. 7 — Chassis ground:

DTC C1231

(B310) No. 37 — Chassis ground:

DTC C1241

(B310) No. 23 — Chassis ground:

Is the resistance 1 MΩ or more?

4

Repair the harness connector between VDCCM&H/U and ABS wheel speed sensor.

4. CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT.
1.

Connect the VDCCM&H/U connector.

2.

Connect the ABS wheel speed sensor connector.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between ABS wheel speed sensor connector and chassis ground.

Connector & terminal

DTC C1211

(B6) No. 1 (+) — Chassis ground (−):

DTC C1221

(B15) No. 1 (+) — Chassis ground (−):

DTC C1231

(R72) No. 2 (+) — Chassis ground (−):

DTC C1241

(R73) No. 2 (+) — Chassis ground (−):

Is the voltage 5 — 16 V?

6

5

5. CHECK VDCCM&H/U POWER SUPPLY CIRCUIT.
1.

Turn the ignition switch to OFF.

2.

Disconnect the VDCCM&H/U connector.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between VDCCM&H/U connector terminals.

Connector & terminal

(B310) No. 1 (+) — (B310) No. 14 (−):

(B310) No. 30 (+) — (B310) No. 46 (−):

(B310) No. 36 (+) — (B310) No. 46 (−):

Is the voltage 10 — 15 V?

6

Check the generator, battery and VDCCM&H/U power supply circuit.

6. CHECK ABS WHEEL SPEED SENSOR.

Check the ABS wheel speed sensor. VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor>INSPECTION VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor>INSPECTION

Is the check result OK?

7

Replace the ABS wheel speed sensor. VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor

7. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

8

8. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1212 FRONT RIGHT ABS SENSOR SIGNAL

For the diagnostic procedure, refer to “DTC C1242 REAR LEFT ABS SENSOR SIGNAL”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1242 REAR LEFT ABS SENSOR SIGNAL

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1222 FRONT LEFT ABS SENSOR SIGNAL

For the diagnostic procedure, refer to “DTC C1242 REAR LEFT ABS SENSOR SIGNAL”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1242 REAR LEFT ABS SENSOR SIGNAL

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1232 REAR RIGHT ABS SENSOR SIGNAL

For the diagnostic procedure, refer to “DTC C1242 REAR LEFT ABS SENSOR SIGNAL”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1242 REAR LEFT ABS SENSOR SIGNAL

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1242 REAR LEFT ABS SENSOR SIGNAL

DTC detecting condition:

- A fault is detected if the time of decompression or hold exceeds the predetermined time.

- A fault is detected if noise of the wheel speed sensor signal is detected.

- A fault is detected if the wheel speed sensor signal is lost, or the wheel speed sensor signal continuously indicates significantly low speed by calculating the difference between maximum speed and minimum speed among the four wheels.

- A fault is detected if the wheel speed sensor signal continuously indicates excessively high or low speed.

- A fault is detected if the wheel speed sensor signal changes irregularly.

- A fault is detected if the wheel speed sensor signal drops cyclically.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

This DTC may be stored when the wheel speed sensor connector is disconnected regardless of the ignition switch condition (ON/OFF). Perform the Clear Memory Mode after diagnosis if a DTC is recorded. COMMON(diag)>Clear memory

1. CHECK ABS WHEEL SPEED SENSOR AND FREEZE FRAME DATA USING SUBARU SELECT MONITOR.
1.

Using the Subaru Select Monitor, check the freeze frame data when DTC is detected. BRAKE CONTROL (DIAGNOSTICS)>Freeze Frame Data

2.

Compare [FR Wheel Speed], [FL Wheel Speed], [RR Wheel Speed] and [RL Wheel Speed] to determine a sensor that is not indicating the same value.

3.

Check the [Data Monitor] of the wheel speed sensor that is not indicating the same value. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Does the speed indicated on [Data Monitor] change in response to the speedometer reading during acceleration/deceleration when the steering wheel is in the straight-ahead position? And, are the values on the freeze frame data of the vehicle speed from the four wheels indicated as almost identical?

2

7

2. CHECK POOR CONTACT OF CONNECTOR.
1.

Turn the ignition switch to OFF.

2.

Check for poor contact of the connector between VDCCM&H/U and ABS wheel speed sensor.

Is there poor contact of connectors between VDCCM&H/U and ABS wheel speed sensor?

Repair the connector.

3

3. CHECK CAUSE OF SIGNAL NOISE.

Make sure the radio wave devices and electronic components are installed correctly.

Are the radio wave devices and electronic components installed correctly?

4

Install the radio wave devices and electronic components properly.

4. CHECK CAUSE OF SIGNAL NOISE.

Check if the noise sources (such as an antenna) are installed near the sensor harness.

Are noise sources installed?

Install the noise sources apart from sensor harness.

5

5. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6

6. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

7. CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.

Are the ABS wheel speed sensor installation bolts tightened to 7.5 N·m (0.76 kgf-m, 5.5 ft-lb)?

8

Tighten the ABS wheel speed sensor installation bolts.

8. CHECK ABS WHEEL SPEED SENSOR.

Check the ABS wheel speed sensor. VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor>INSPECTION VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor>INSPECTION

Is the check result OK?

10

9

9. CHECK ABS WHEEL SPEED SENSOR OR MAGNETIC ENCODER.

Are there foreign matters adhered to the tip of ABS wheel speed sensor or magnetic encoder? Or is there any breakage or damage?

Remove dirt thoroughly. Also replace the ABS wheel speed sensor or magnetic encoder as a unit with hub unit bearing if it is broken or damaged.

10

10. CHECK CAUSE OF SIGNAL NOISE.

Make sure the radio wave devices and electronic components are installed correctly.

Are the radio wave devices and electronic components installed correctly?

11

Install the radio wave devices and electronic components properly.

11. CHECK CAUSE OF SIGNAL NOISE.

Check if the noise sources (such as an antenna) are installed near the sensor harness.

Are noise sources installed?

Install the noise sources apart from sensor harness.

12

12. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

13

14

13. CHECK FREEZE FRAME DATA OF ABS WHEEL SPEED SENSOR USING SUBARU SELECT MONITOR.
1.

Using the Subaru Select Monitor, select Freeze frame data. BRAKE CONTROL (DIAGNOSTICS)>Freeze Frame Data

2.

Read the ABS wheel speed sensor output.

Is the ABS wheel speed sensor output different compared with other wheels?

Replace the ABS wheel speed sensor which has a difference. VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

14. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

- Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

- Though the ABS warning light may remain on at this time, this is normal. Drive the vehicle at 40 km/h (25 MPH) or more in order to turn ABS warning light off. Be sure to drive the vehicle and check that the warning light goes off.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1251 WHEEL SPEED SENSOR SYSTEM

For the diagnostic procedure, refer to “DTC C1241 REAR LEFT ABS SENSOR CIRCUIT”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1241 REAR LEFT ABS SENSOR CIRCUIT

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS

DTC detecting condition:

- Defective ABS wheel speed sensor signal (noise, irregular signal, etc.)

- Defective magnetic encoder

- When a wheel is turned freely for a long time

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- EBD may not operate.

- AVH does not function.

- EyeSight does not operate. (Model with EyeSight)

Brake warning light comes on as well as ABS warning light when EBD does not operate.

1. WHETHER A WHEEL TURNED FREELY OR NOT.

Check if the wheels have been turned freely for one minute or more, such as when the vehicle is jacked-up, under full-lock cornering or when the wheels are not in contact with road surface.

Did the wheels turn freely?

- VDC System is normal. Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

- This diagnostic trouble code may sometimes occur if the wheels turn freely for a long time, for example when the vehicle is towed or jacked-up, or when steering wheel is continuously turned all the way.

2

2. CHECK TIRE SPECIFICATIONS.

Turn the ignition switch to OFF.

Are the tire specifications correct?

3

Replace the tire.

3. CHECK WEAR OF TIRE.

Is the tire worn excessively?

Replace the tire.

4

4. CHECK TIRE INFLATION PRESSURE.

Is the tire pressure correct?

5

Adjust the tire pressure.

5. CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.

Are the ABS wheel speed sensor installation bolts tightened to 7.5 N·m (0.76 kgf-m, 5.5 ft-lb)? (Four wheels)

6

Tighten the ABS wheel speed sensor installation bolts.

6. CHECK ABS WHEEL SPEED SENSOR SIGNAL.

Check the ABS wheel speed sensor. VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor>INSPECTION VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor>INSPECTION

Is the check result OK?

8

7

7. CHECK ABS WHEEL SPEED SENSOR OR MAGNETIC ENCODER.

Are there foreign matters adhered to the tip of ABS wheel speed sensor or magnetic encoder? Or is there any breakage or damage? (Four wheels)

Remove dirt thoroughly. Also replace the ABS wheel speed sensor or magnetic encoder as a unit with hub unit bearing if it is broken or damaged.

8

8. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

9

9. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1311 FR HOLD VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1312 FR PRESSURE REDUCING VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1321 FL HOLD VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1322 FL PRESSURE REDUCING VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1331 RR HOLD VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1332 RR PRESSURE REDUCING VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1341 RL HOLD VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1342 RL PRESSURE REDUCING VALVE

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1351 NORMAL OPENING VALVE 1

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1352 NORMAL OPENING VALVE 2

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1361 NORMAL CLOSING VALVE 1

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1362 NORMAL CLOSING VALVE 2

DTC detecting condition:

A fault is detected if electrical malfunction judgment is generated for VDCH/U solenoid valve.

Trouble symptom:

- ABS does not operate.

- EBD does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK VDCCM&H/U INPUT VOLTAGE.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Run the engine at idle.

4.

Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 1 (+) — Chassis ground (−):

(B310) No. 30 (+) — Chassis ground (−):

(B310) No. 36 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair the power supply circuit including the battery.

2. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

3

Repair the VDCCM&H/U ground harness.

3. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between generator, battery and VDCCM&H/U?

Repair the connector.

4

4. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

5

5. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1411 ELECTRICAL CONTROL MODULE

DTC detecting condition:

- Judge as malfunction when ECM internal malfunction is detected.

- This malfunction is stored if the electronic parking brake does not operate.

Trouble symptom:

- ABS does not operate sometimes.

- EBD does not operate sometimes.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance between VDCCM&H/U and chassis ground.

Connector & terminal

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

2

Repair the VDCCM&H/U ground harness.

2. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of the connector between the battery, ignition switch and VDCCM&H/U?

Repair the connector.

3

3. CHECK CAUSE OF SIGNAL NOISE.

Are the radio wave devices and electronic components installed correctly?

4

Install the radio wave devices and electronic components properly.

4. CHECK CAUSE OF SIGNAL NOISE.

Is there a noise source (such as an antenna) installed near the sensor harness and VDCCM?

Install the noise sources apart from sensor harness and VDCCM.

5

5. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6

6. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1412 SELECTED PARAMETER

DTC detecting condition:

A fault is detected if abnormal set value is found on the vehicle model that were given some parameters.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

When the VDCCM&H/U is replaced, this DTC may be stored.

1. CHECK VDCCM&H/U IDENTIFICATION SYMBOL.

Check the identification symbol attached on the H/U. VEHICLE DYNAMICS CONTROL (VDC)>General Description>SPECIFICATION

Is the identification symbol correct?

2

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

2. CHECK PARAMETER SELECTED IN VDCCM.

Check the VDCCM parameters. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER CHECK

Does the parameter registered in the VDCCM match the relevant vehicle?

3

Select and register the correct parameter. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER SELECTION

3. CHECK SPECIFICATIONS OF OTHER CONTROL MODULES.

Check the specifications of ECM and TCM.

Are the specifications of ECM and TCM the same as vehicle specification?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the ECM and TCM. FUEL INJECTION (FUEL SYSTEMS)(H4DO)>Engine Control Module (ECM) CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>Transmission Control Module (TCM)

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1413 POWER SUPPLY VOLTAGE

DTC detecting condition:

A fault is detected if the power supply voltage is out of normal range for a predetermined time or more.

Trouble symptom:

- ABS does not operate.

- EBD may not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

Warning lights go off if voltage returns.

1. CHECK GENERATOR.
1.

Start the engine.

2.

Run the engine at idle after warming up.

3.

Measure the voltage between generator terminal B and chassis ground.

Terminals

Generator terminal B (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair the generator.

2. CHECK BATTERY TERMINAL.

Turn the ignition switch to OFF.

Are the battery positive terminal and the battery sensor ground terminal securely installed?

3

Install the battery terminal correctly.

3. CHECK VDCCM&H/U INPUT VOLTAGE.
1.

Disconnect the connector from the VDCCM&H/U.

2.

Run the engine at idle.

3.

Operate devices such as headlights, air conditioner, rear defogger, etc. which produce an electrical load.

4.

Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 1 (+) — Chassis ground (−):

(B310) No. 30 (+) — Chassis ground (−):

(B310) No. 36 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

4

Repair the power supply circuit.

4. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 14 — Chassis ground:

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

5

Repair the VDCCM&H/U ground harness circuit.

5. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between generator, battery and VDCCM&H/U?

Repair the connector.

6

6. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1421 ECM CONTROL SYSTEM

Refer to “DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE” for diagnostic procedure. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

DTC detecting condition:

A fault is detected if engine control prohibition flag from ECM is received.

Trouble symptom:

VDC does not operate.

The warning light goes off if the engine control prohibition flag from ECM returns normally.

1. CHECK COOPERATION CONTROL FEASIBILITY OF ECM USING SUBARU SELECT MONITOR.
1.

Start the engine, and run the engine at idle approximately 5 minutes.

2.

Using Subaru Select Monitor, display [E/G Torque Down Control Stop Flag] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is “1” displayed in [E/G Torque Down Control Stop Flag]?

4

2

2. CHECK WARNING LIGHT.

Check whether the VDC warning light illuminates after driving for 1 minute or more at a speed of 10 km/h (6 MPH) or more.

Does the VDC warning light illuminate?

3

- VDC System is normal. Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

- DTC may be recorded if cranking is performed during driving.

3. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of ECM connector?

Repair the connector.

4

4. CHECK DTC OF ECM.

Read the DTC of [Engine] using the Subaru Select Monitor. ENGINE (DIAGNOSTICS)(H4DO)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed?

Perform the diagnosis according to the DTC. ENGINE (DIAGNOSTICS)(H4DO)>Diagnostic Trouble Code (DTC)>LIST

5

5. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6

6. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1423 DIFFERENT ECU SPECIFICATIONS

DTC detecting condition:

A fault is detected if the vehicle type information obtained from ECM via communication is different from the parameter setting information.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

When parameter selection for VDCCM is improper, this DTC may be memorized.

1. CHECK VDCCM&H/U IDENTIFICATION SYMBOL.

Check the identification symbol attached on the H/U. VEHICLE DYNAMICS CONTROL (VDC)>General Description>SPECIFICATION

Is the identification symbol correct?

2

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

2. CHECK PARAMETER SELECTED IN VDCCM.

Check the VDCCM parameters. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER CHECK

Does the parameter registered in the VDCCM match the relevant vehicle?

3

Select and register the correct parameter. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>MAINTENANCE MODE > VDCCM PARAMETER SELECTION

3. CHECK TCM SPECIFICATION.

Check the TCM specification.

Is the specification of TCM same as vehicle specification?

4

Replace the TCM. CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>Transmission Control Module (TCM)

4. CHECK CVT SYSTEM.
1.

Start the engine.

2.

Read the DTC of [Transmission] using the Subaru Select Monitor. TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed?

Perform the diagnosis according to the DTC. TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

5

5. CHECK ECM SPECIFICATION.

Check the ECM specification.

Is the specification of ECM same as vehicle specification?

6

Replace the ECM. FUEL INJECTION (FUEL SYSTEMS)(H4DO)>Engine Control Module (ECM)

6. CHECK ENGINE SYSTEM.
1.

Start the engine.

2.

Read the DTC of [Engine] using the Subaru Select Monitor. ENGINE (DIAGNOSTICS)(H4DO)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed?

Perform the diagnosis according to the DTC. ENGINE (DIAGNOSTICS)(H4DO)>Diagnostic Trouble Code (DTC)>LIST

7

7. CHECK VDCCM&H/U.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

8

8. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1424 ECM

DTC detecting condition:

A fault is detected if malfunction judgment flag for the engine system is received from ECM for a predetermined time or more.

Trouble symptom:

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

1. CHECK ECM.
1.

Start the engine.

2.

Read the DTC of [Engine] using the Subaru Select Monitor. ENGINE (DIAGNOSTICS)(H4DO)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed?

Perform the diagnosis according to the DTC. ENGINE (DIAGNOSTICS)(H4DO)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK VDCCM&H/U.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

3

3. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1431 AT

DTC detecting condition:

A fault is detected if malfunction flag is received from TCM.

Trouble symptom:

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

1. CHECK TCM.
1.

Start the engine.

2.

Read the DTC of [Transmission] using the Subaru Select Monitor. TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs displayed?

Perform the diagnosis according to the DTC. TRANSMISSION (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK VDCCM&H/U.
1.

Turn the ignition switch to OFF.

2.

After turning the ignition switch to ON for approx. 10 seconds, turn it to OFF.

3.

Turn the ignition switch to ON again.

4.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

5.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

6.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

3

3. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1432 DIFFERENT ECU SPECIFICATIONS

For the diagnostic procedure, refer to “DTC C1423 DIFFERENT ECU SPECIFICATIONS”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1423 DIFFERENT ECU SPECIFICATIONS

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1441 EyeSight REQUEST PRESSURE ABNORMAL

DTC detecting condition:

Defective stereo camera

Trouble symptom:

EyeSight does not operate. (Model with EyeSight)

1. CHECK DTC DETECTION OF OTHER SYSTEM.

Read the DTC using Subaru Select Monitor. COMMON(diag)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC.

2

2. CHECK LAN SYSTEM.

Check the LAN system. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the check result OK?

3

Perform the diagnosis for LAN system.

3. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of the stereo camera connector?

Repair the connector.

4

4. CHECK STEREO CAMERA.

Perform the diagnosis for the EyeSight system. EyeSight (DIAGNOSTICS)>Basic Diagnostic Procedure

Is the stereo camera normal?

5

Check the EyeSight system.

5. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1511 VALVE RELAY

DTC detecting condition:

A fault is detected if valve relay drive voltage failure is detected.

Trouble symptom:

- ABS does not operate.

- EBD does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK VDCCM&H/U INPUT VOLTAGE.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Run the engine at idle.

4.

Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 30 (+) — Chassis ground (−):

(B310) No. 36 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair the power supply circuit.

2. CHECK VDCCM&H/U INPUT VOLTAGE.

Calculate the voltage difference measured in step 1.

A: (B310) No. 30 (+) — Chassis ground (−):

B: (B310) No. 36 (+) — Chassis ground (−):

Is the voltage difference between A and B 2 V or more?

Repair the power supply circuit.

3

3. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

4

Repair the VDCCM&H/U ground harness.

4. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between generator, battery and VDCCM&H/U?

Repair the connector.

5

5. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6

6. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1512 VALVE SYSTEM

For the diagnostic procedure, refer to “DTC C1362 NORMAL CLOSING VALVE 2 MALFUNCTION”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1521 MOTOR RELAY

DTC detecting condition:

A fault is detected if the pump motor supply voltage becomes significantly low when the pump motor is not driven.

Trouble symptom:

- ABS does not operate sometimes.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK VDCCM&H/U INPUT VOLTAGE.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 1 (+) — Chassis ground (−):

(B310) No. 36 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair the VDCCM&H/U power supply circuit.

2. CHECK VDCCM&H/U INPUT VOLTAGE.

Calculate the voltage difference measured in step 1.

A: (B310) No. 1 (+) — Chassis ground (−):

B: (B310) No. 36 (+) — Chassis ground (−):

Is the voltage difference between A and B 2 V or more?

Repair the power supply circuit.

3

3. CHECK INSTALLATION OF VDCCM&H/U GROUND.

Is the VDCCM&H/U ground terminal installation bolt installed correctly?

4

Install the VDCCM&H/U ground terminal installation bolt correctly.

4. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 14 — Chassis ground:

Is the resistance less than 10 Ω?

5

Repair the VDCCM&H/U ground harness.

5. CHECK VDCCM&H/U MOTOR RELAY.

Measure the resistance between VDCCM&H/U terminals.

Terminals

No. 1 — No. 14:

Is the resistance 1 MΩ or more?

6

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6. CHECK POOR CONTACT OF CONNECTORS.

Turn the ignition switch to OFF.

Is there poor contact of connector between generator, battery and VDCCM&H/U?

Repair the connector.

7

7. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

8

8. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1531 BLS OFF STUCK

DTC detecting condition:

A fault is detected if stop light switch signal is OFF for a predetermined time or more with the pressure signal of the pressure sensor high.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Stop light system WIRING SYSTEM>Stop Light System

1. CHECK STOP LIGHT SWITCH.

Check the stop light switch. BRAKE>Stop Light Switch>INSTALLATION

Is the check result OK?

2

Adjust the installation position of the stop light switch. BRAKE>Stop Light Switch>INSTALLATION

2. CHECK STOP LIGHT SWITCH.
1.

Disconnect the stop light switch connector.

2.

Measure the resistance of stop light switch terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 1 Ω when the stop light switch is ON (when pedal is depressed)?

3

Replace the stop light switch. BRAKE>Stop Light Switch

3. CHECK STOP LIGHT RELAY.

Measure the resistance of stop light relay terminals.

Terminals

No. 7 — No. 10:

Is the resistance less than 1 Ω?

4

Replace the stop light relay. VEHICLE DYNAMICS CONTROL (VDC)>Relay and Fuse

4. CHECK VDCCM&H/U CONNECTOR.

Disconnect the connector from the VDCCM&H/U.

Is there poor contact or damage of the VDCCM&H/U connector?

Repair the VDCCM&H/U connector.

5

5. CHECK STOP LIGHT SWITCH CIRCUIT (CHECK FOR OPEN CIRCUIT).

Measure the resistance of stop light switch circuit.

Connector & terminal

(B310) No. 38 — (B225) No. 10:

(B65) No. 2 — (B225) No. 7:

(B65) No. 1 — (F/B fuse) No. 37:

Is the resistance less than 1 Ω?

6

Repair the stop light switch circuit.

6. CHECK STOP LIGHT SWITCH CIRCUIT.
1.

Connect all connectors.

2.

Turn the ignition switch to ON.

3.

Measure the voltage between stop light relay and chassis ground.

Connector & terminal

(B225) No. 10 (+) — Chassis ground (−):

Is the voltage 10 V or more when the stop light switch is ON (when pedal is depressed)?

7

Repair the stop light switch circuit.

7. CHECK VDCCM&H/U.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

8

8. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1532 BLS ON STUCK

DTC detecting condition:

- A fault is detected if a change of the vehicle speed from high to low occurs for a predetermined number of times or more, while a change of the stop light switch from OFF to ON is not detected.

- A fault is detected if stop light switch ON status continues for long time while the vehicle speed is at the predetermined speed or higher.

Trouble symptom:

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Stop light system WIRING SYSTEM>Stop Light System

If the pressure sensor is defective, this DTC may probably be stored in addition to pressure sensor malfunction.

1. INTERVIEW CUSTOMERS.

Make sure that the operation was performed in which accelerator pedal and brake pedal were depressed simultaneously (with depressing brake pedal with left foot).

Were the acceleration pedal and brake pedal depressed simultaneously?

System is normal. (DTC may be recorded if the brake pedal is always depressed while driving.)

2

2. CHECK STOP LIGHT RELAY.
1.

Turn the ignition switch to OFF.

2.

Measure the resistance of stop light relay terminals.

Terminals

No. 9 — No. 10:

Is the resistance less than 1 Ω?

Replace the stop light relay. VEHICLE DYNAMICS CONTROL (VDC)>Relay and Fuse

3

3. CHECK VDCCM&H/U CONNECTOR.

Disconnect the connector from the VDCCM&H/U.

Is there poor contact or damage of the VDCCM&H/U connector?

Repair the VDCCM&H/U connector.

4

4. CHECK STOP LIGHT SWITCH CIRCUIT.
1.

Turn the ignition switch to ON.

2.

Measure the voltage between stop light relay and chassis ground.

Connector & terminal

(B225) No. 10 (+) — Chassis ground (−):

Is the voltage 10 V or more when the stop light switch is OFF (when pedal is not depressed)?

Repair the stop light switch circuit.

5

5. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6

6. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1571 BRAKE LAMP RELAY OFF STUCK

DTC detecting condition:

A fault is detected if the stop light relay operation request were compared with the feedback signal and detected as follows:

- The feedback signal is OFF.

- The stop light relay operation request is ON.

Trouble symptom:

- EyeSight does not operate. (Models with EyeSight)

- Stop lights do not illuminate sometimes.

Wiring diagram:

Stop light system WIRING SYSTEM>Stop Light System

1. CHECK DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Are any DTCs related to the stop light switch displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

2

2. CHECK STOP LIGHT RELAY.
1.

Turn the ignition switch to OFF.

2.

Remove the stop light relay.

3.

Measure the resistance between stop light relay terminals No. 6 — No. 8 when the battery voltage is applied.

Terminals

No. 9 — No. 10:

Is the resistance less than 1 Ω?

3

Replace the stop light relay. VEHICLE DYNAMICS CONTROL (VDC)>Relay and Fuse

3. CHECK VDCCM&H/U CONNECTOR.

Disconnect the connector from the VDCCM&H/U.

Is there poor contact or damage of the VDCCM&H/U connector?

Repair the VDCCM&H/U connector.

4

4. CHECK STOP LIGHT SWITCH CIRCUIT.

Measure the resistance between the stop light relay and the fuse.

Connector & terminal

(B225) No. 9 — (F/B fuse) No. 37:

Is the resistance less than 1 Ω?

5

Repair or replace the open circuit in the power supply circuit including the fuse.

5. CHECK STOP LIGHT SWITCH CIRCUIT.
1.

Connect all connectors.

2.

Turn the ignition switch to ON.

3.

Measure the voltage between stop light relay and chassis ground.

Connector & terminal

(B225) No. 9 (+) — Chassis ground (−):

Is the voltage 10 V or more?

6

Repair or replace the open circuit in the power supply circuit including the fuse.

6. CHECK STOP LIGHT RELAY CIRCUIT.
1.

Turn the ignition switch to OFF.

2.

Remove the stop light relay.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between stop light relay and chassis ground.

Connector & terminal

(B225) No. 6 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the stop light relay circuit.

7

7. CHECK STOP LIGHT RELAY CIRCUIT.

Measure the voltage between stop light relay and chassis ground.

Connector & terminal

(B225) No. 8 (+) — Chassis ground (−):

Is the voltage 10 V or more?

8

Repair the ignition power supply circuit.

8. CHECK VDCCM&H/U.
1.

Turn the ignition switch to OFF.

2.

Connect all connectors and relays.

3.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

9

9. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1572 BRAKE LAMP RELAY ON STUCK

DTC detecting condition:

Defective stop light relay signal

Trouble symptom:

- Hill descent control does not operate. (Model with X mode)

- EyeSight does not operate. (Model with EyeSight)

- Brake lights do not go off sometimes.

Wiring diagram:

Stop light system WIRING SYSTEM>Stop Light System

1. CHECK FUSE.
1.

Turn the ignition switch to OFF.

2.

Check F/B fuse (No. 10).

Is the fuse blown out?

Replace F/B fuse (No. 10).

2

2. CHECK STOP LIGHT RELAY.

Measure the resistance between brake light relay terminals.

Terminals

No. 6 — No. 8:

Is the resistance less than 1 Ω?

3

Replace the stop light relay.

3. CHECK VDCCM&H/U CONNECTOR.

Disconnect the connector from the VDCCM&H/U.

Is there poor contact or damage of the VDCCM&H/U connector?

Repair the VDCCM&H/U connector.

4

4. CHECK STOP LIGHT RELAY CIRCUIT.

Measure the resistance between the stop light relay and the fuse or the VDCCM&H/U connector.

Connector & terminal

(B225) No. 6 — (B310) No. 33:

(B225) No. 8 — (F/B fuse) No. 10:

Is the resistance less than 1 Ω?

5

Repair the stop light relay circuit.

5. CHECK STOP LIGHT RELAY CIRCUIT.
1.

Connect all connectors.

2.

Turn the ignition switch to ON.

3.

Measure the voltage between stop light relay and chassis ground.

Connector & terminal

(B225) No. 8 (+) — Chassis ground (−):

Is the voltage 10 V or more?

6

Repair the stop light relay circuit.

6. CHECK VDCCM&H/U.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1581 BRAKE BOOST NEGATIVE PRESSURE ABNORMAL

DTC detecting condition:

This malfunction is stored if vacuum pressure value inside brake booster drops below the normal pressure and stays for a specific period of time.

Trouble symptom:

Brake pedal becomes heavier. (Brake assist function is activated when vacuum pressure drops.)

1. CHECK DTC.
1.

Start the engine.

2.

Warm up for at least three minutes.

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC C1581 a current malfunction?

2

Currently, it is normal. It results from a temporary vacuum pressure drop.

2. CHECK OUTPUT OF BRAKE BOOSTER PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

Using Subaru Select Monitor, display [Brake Booster Gauge Sensor Output] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is [Brake Booster Gauge Sensor Output] −20 kPa or more?

3

Currently, it is normal. It results from a temporary vacuum pressure drop.

3. CHECK OUTPUT OF BRAKE BOOSTER PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

Using Subaru Select Monitor, read [Brake Booster Gauge Sensor Output] of [Data Monitor] while depressing the brake pedal several times. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Does the value of [Brake Booster Gauge Sensor Output] change along with the operation?

Currently, it is normal. It results from a temporary vacuum pressure drop.

4

4. CHECK BRAKE VACUUM SYSTEM.
1.

Check for connections and air tightness of brake vacuum system (between brake booster and intake manifold).

2.

Check for connections and air tightness of brake vacuum system (between brake booster and brake vacuum pump).

Are there any air leaks in the brake vacuum system?

Repair the air leak in the brake vacuum system.

Replace the brake booster. BRAKE>Brake Booster

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1711 STEERING ANGLE SENSOR

DTC detecting condition:

- A fault is detected if the sensor signal value is not correct.

- A fault is detected if the yaw rate sensor signal / lateral G sensor signal change while the sensor signal of steering angle sensor indicates a constant value.

- A fault is detected if the communication status of steering angle sensor is abnormal.

Trouble symptom:

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK POWER SUPPLY FOR STEERING ANGLE SENSOR.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from steering angle sensor.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between steering angle sensor and chassis ground.

Connector & terminal

(i74) No. 4 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair the steering angle sensor power supply circuit including the fuse.

2. CHECK GROUND CIRCUIT OF STEERING ANGLE SENSOR (CHECK FOR OPEN CIRCUIT).

Measure the resistance between steering angle sensor and chassis ground.

Connector & terminal

(i74) No. 1 — Chassis ground:

Is the resistance less than 10 Ω?

3

Repair ground circuit in the steering angle sensor.

3. CHECK STEERING ANGLE SENSOR HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Disconnect the connector from the VDCCM&H/U.

2.

Measure the resistance between VDCCM&H/U and steering angel sensor.

Connector & terminal

(i74) No. 2 — (B310) No. 19:

(i74) No. 3 — (B310) No. 5:

Is the resistance less than 1 Ω?

4

Repair the harness between the steering angle sensor and VDCCM&H/U.

4. CHECK GROUND SHORT CIRCUIT OF STEERING ANGLE SENSOR HARNESS.

Measure the resistance between steering angle sensor and chassis ground.

Connector & terminal

(i74) No. 2 — Chassis ground:

(i74) No. 3 — Chassis ground:

Is the resistance 1 MΩ or more?

5

Repair the harness between the steering angle sensor and VDCCM&H/U.

5. CHECK STEERING WHEEL.
1.

Drive the vehicle on a flat road.

2.

Park the vehicle straight.

3.

Check the steering wheel for deviation from center.

Is the deviation from the center of steering wheel less than 5°?

6

Perform the centering adjustment of steering wheel, and perform the VDC sensor midpoint setting mode. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

6. CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR.
1.

Adjust steering wheel to the center position.

2.

Using Subaru Select Monitor, display [Steering Angle Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the value of [Steering Angle Sensor] −10° — 10°?

Perform the VDC sensor midpoint setting mode. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE 7

Check the installation of the steering wheel and steering angle sensor.

7. CHECK STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR.
1.

Turn the ignition switch to OFF.

2.

Connect all connectors.

3.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

4.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

5.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the steering angle sensor. VEHICLE DYNAMICS CONTROL (VDC)>Steering Angle Sensor

8

8. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1721 YAW RATE SENSOR

DTC detecting condition:

- A fault is detected if the sensor signal value is not correct.

- A fault is detected if the steering angle sensor signal / lateral G sensor signal change while the yaw rate sensor signal indicates a constant value.

- A fault is detected if the communication status of yaw rate sensor is abnormal.

Trouble symptom:

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

1. INTERVIEW CUSTOMERS.

Check if the vehicle ran the road with banks or sandy surface (which does not mean a dirt road).

Did the vehicle run the road with banks or sandy surface (which does not mean a dirt road)?

VDCCM&H/U may record DTC when the vehicle ran the road with banks or sandy surface (which does not mean a dirt road).

2

2. CHECK INSTALLATION OF VDCCM&H/U.

Is VDCCM&H/U installed properly without being tilted?

Is the bracket deformation-free?

Are the VDCCM&H/U installation bolts installed without missing or getting loose?

3

- Repair the defective part.

  - Install VDCCM&H/U properly.

  - Replace the bracket if faulty.

  - Tighten the VDCCM&H/U installation bolt. VEHICLE DYNAMICS CONTROL (VDC)>General Description>COMPONENT > VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U)

    3

3. CHECK OUTPUT OF YAW RATE & G SENSOR WITH SUBARU SELECT MONITOR.
1.

Drive the vehicle on a flat road.

2.

Park the vehicle straight.

3.

Using Subaru Select Monitor, display [Yaw Rate Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the reading of [Yaw Rate Sensor] −4 — 4 deg/s?

4

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

4. CHECK OUTPUT OF STEERING ANGLE SENSOR WITH SUBARU SELECT MONITOR.
1.

Drive the vehicle on a flat road.

2.

Park the vehicle straight.

3.

Using Subaru Select Monitor, display [Steering Angle Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the value of [Steering Angle Sensor] −10 — 10°?

5

Perform the centering adjustment of steering wheel.

5. CHECK VDCCM&H/U.
1.

Turn the ignition switch to OFF.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6

6. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1731 G SENSOR ABNORMAL

For the diagnostic procedure, refer to “DTC C1732 LATERAL G SENSOR”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1732 LATERAL G SENSOR

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1732 LATERAL G SENSOR

DTC detecting condition:

- A fault is detected if the sensor signal value is not correct.

- A fault is detected if the steering angle sensor signal / yaw rate sensor signal change while the lateral G sensor signal indicates a constant value.

- A fault is detected if the communication status of lateral G sensor is abnormal.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

1. CHECK INSTALLATION OF VDCCM&H/U.

Is VDCCM&H/U installed properly without being tilted?

Is the bracket deformation-free?

Are the VDCCM&H/U installation bolts installed without missing or getting loose?

2

- Repair the defective part.

  - Install VDCCM&H/U properly.

  - Replace the bracket if faulty.

  - Tighten the VDCCM&H/U installation bolt. VEHICLE DYNAMICS CONTROL (VDC)>General Description>COMPONENT > VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U)

    2

2. CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR.
1.

Park the vehicle straight on a level surface.

2.

Using Subaru Select Monitor, display [Steering Angle Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the value of [Steering Angle Sensor] −10 — 10°?

3

Check the installation of steering angle sensor.

3. CHECK OUTPUT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR.
1.

Park the vehicle straight on a level surface.

2.

Using Subaru Select Monitor, display [Lateral G Sensor] and [Longitudinal G Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Are the values of [Lateral G Sensor] and [Longitudinal G Sensor] −2 — 2 m/s2?

4

Recheck from step 1, and if the problem is not solved, 7

4. SET 0 POINT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR.
1.

Select the [Work Support] using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Work Support

2.

Perform the VDC sensor midpoint setting mode. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

Is 0 point setting successful?

5

Recheck from step 1, and when the 0 point setting is not possible, replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

5. PERFORM DRIVING TEST.

BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

Does the ABS warning light or VDC warning light illuminate during driving?

Does ABS or VDC operate abnormally?

Recheck from step 1, and when the warning lights illuminate or improperly operate, replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

6

6. CHECK OUTPUT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR.
1.

Park the vehicle on a level surface.

2.

Using Subaru Select Monitor, display [Lateral G Sensor] and [Longitudinal G Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Are the values of [Lateral G Sensor] and [Longitudinal G Sensor] −1.5 — 1.5 m/s2?

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

Recheck from step 1, and if the problem is not solved, replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7. CHECK OUTPUT OF LATERAL G SENSOR AND LONGITUDINAL G SENSOR WITH SUBARU SELECT MONITOR.
1.

Remove the VDCCM&H/U installation bolt and bracket.

2.

Keep VDCCM&H/U in a horizontal position.

3.

Using Subaru Select Monitor, display [Lateral G Sensor] and [Longitudinal G Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

When the VDCCM & H/U is in a horizontal position, are the values of [Lateral G Sensor] and [Longitudinal G Sensor] −1.5 — 1.5 m/s2?

Check the bracket and brake pipe, and install VDCCM&H/U in a horizontal position to the vehicle.

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1733 LONGITUDINAL G SENSOR

DTC detecting condition:

- A fault is detected if the communication status of longitudinal G sensor is abnormal.

- A fault is detected if malfunction judgment is generated by self-diagnosis test of the longitudinal G sensor.

- A fault is detected if the longitudinal G sensor signal is out of normal range.

- A fault is detected if the longitudinal G sensor compensation value is out of normal range.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

For the diagnostic procedure, refer to “DTC C1732 LATERAL G SENSOR”. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1732 LATERAL G SENSOR

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1741 PRESSURE SENSOR

DTC detecting condition:

- A fault is detected if the fluid pressure signal in master cylinder are out of normal range.

- A fault is detected if the condition that supply voltage for the fluid pressure sensor is out of normal judgment range continues for predetermined time.

- A fault is detected if the communication status of fluid pressure sensor is abnormal.

- A fault is detected if the data of fluid pressure sensor is abnormal.

- A fault is detected if the offset value of fluid pressure sensor signal exceeds a predetermined judgment value.

Trouble symptom:

- VDC does not operate sometimes.

- ABS does not operate sometimes.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

1. CHECK STOP LIGHT SWITCH CIRCUIT AND INSTALLATION CONDITION.

Check the stop light switch circuit and the installation condition.

Is the check result OK?

2

- Repair the stop light switch circuit or correct the installation condition.

- If there is malfunction in the stop light circuit, DTC may be recorded in the memory.

2. CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

Using Subaru Select Monitor, display [Pressure Sensor Output] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

With the brake pedal released, is the value of [Pressure Sensor Output] 0 — 11 bar?

3

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

3. CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

Using Subaru Select Monitor, display [Pressure Sensor Output] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

When the brake pedal is operated, does the value of [Pressure Sensor Output] change in accordance with the brake pedal?

4

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

4. CHECK VDCCM&H/U.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

5

5. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1742 WHEEL CYLINDER PRESSURE SENSOR

DTC detecting condition:

- A fault is detected if the condition that supply voltage for the fluid pressure sensor is out of normal judgment range continues for predetermined time.

- A fault is detected if the communication status of fluid pressure sensor is abnormal.

- A fault is detected if the data of fluid pressure sensor is abnormal.

- A fault is detected if the offset value of fluid pressure sensor signal exceeds a predetermined judgment value.

- A fault is detected if a difference between fluid pressures for the wheels exceeds a predetermined judgment value.

- A fault is detected if master cylinder pressure and fluid pressures for the wheels exceed predetermined judgment values.

Trouble symptom:

EyeSight does not operate. (Models with EyeSight)

1. CHECK STOP LIGHT SWITCH CIRCUIT AND INSTALLATION CONDITION.

Check the stop light switch circuit and the installation condition.

Is the check result OK?

2

Repair the stop light switch circuit or correct the installation condition.

2. CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

Using Subaru Select Monitor, display [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

With the brake pedal released, is the value of [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] 0 — 11 bar?

3

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

3. CHECK OUTPUT OF PRESSURE SENSOR WITH SUBARU SELECT MONITOR.

Using Subaru Select Monitor, display [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

When the brake pedal is operated, do the values of [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] change in accordance with the brake pedal? In addition, is the difference between [FL wheel cylinder pressure sensor output] and [FR wheel cylinder pressure sensor output] values less than 10 bar?

4

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

4. CHECK VDCCM&H/U.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

5

5. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1751 BRAKE BOOST GAUGE SENSOR

DTC detecting condition:

- A fault is detected if the power supply to the brake vacuum pressure sensor is abnormal.

- A fault is detected if the communication signal from the brake vacuum pressure sensor is abnormal.

Trouble symptom:

Brake assist function is not activated when vacuum pressure drops.

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK BRAKE BOOSTER PRESSURE SENSOR POWER SUPPLY.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the brake booster pressure sensor.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between brake booster pressure sensor connector terminals.

Connector & terminal

(B565) No. 1 (+) — (B565) No. 2 (−):

Is the voltage 4.9 — 5.1 V?

3

2

2. CHECK BRAKE BOOSTER PRESSURE SENSOR POWER SUPPLY SYSTEM.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance between the VDCCM&H/U and the brake booster pressure sensor connector.

Connector & terminal

(B310) No. 20 — (B565) No. 1:

(B310) No. 28 — (B565) No. 2:

Is the resistance less than 1 Ω?

3

Repair the harness connector between the VDCCM&H/U and the brake booster pressure sensor.

3. CHECK BRAKE BOOSTER PRESSURE SENSOR SIGNAL SYSTEM.

Measure the resistance between the VDCCM&H/U connector and the brake booster pressure sensor.

Connector & terminal

(B310) No. 45 — (B565) No. 3:

Is the resistance less than 1 Ω?

Replace the brake booster. BRAKE>Brake Booster

Repair the harness connector between the VDCCM&H/U and the brake booster pressure sensor.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1811 SYSTEM

DTC detecting condition:

A fault is detected if VDC control status and ABS control status continue for a long period of time.

Trouble symptom:

- ABS does not operate.

- VDC does not operate.

- AVH does not function.

- EyeSight does not operate. (Models with EyeSight)

1. CHECK INSTALLATION OF VDCCM&H/U.

Is VDCCM&H/U installed properly without being tilted?

Is the bracket deformation-free?

Are the VDCCM&H/U installation bolts installed without missing or getting loose?

2

- Repair the defective part.

  - Install VDCCM&H/U properly.

  - Replace the bracket if faulty.

  - Tighten the VDCCM&H/U installation bolt. VEHICLE DYNAMICS CONTROL (VDC)>General Description>COMPONENT > VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM&H/U)

    2

2. CHECK STEERING WHEEL.
1.

Drive the vehicle on a flat road.

2.

Park the vehicle straight.

3.

Check the steering wheel for deviation from center.

Is the deviation from the center of steering wheel less than 5°?

3

Perform the centering adjustment of steering wheel, and perform the VDC sensor midpoint setting mode. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

3

3. CHECK OUTPUT OF STEERING ANGLE SENSOR USING SUBARU SELECT MONITOR.
1.

Adjust steering wheel to the center position.

2.

Using Subaru Select Monitor, display [Steering Angle Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the value of [Steering Angle Sensor] −10° — 10°?

4

Check the installation of the steering wheel and steering angle sensor, and correct the installation if it is improper. If the installation condition is correct, replace the sensor.

4. CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR.
1.

Drive the vehicle on a flat road.

2.

Park the vehicle straight.

3.

Using Subaru Select Monitor, display [Lateral G Sensor], [Longitudinal G Sensor], and [Yaw Rate Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the reading of each sensor following value?

[Lateral G Sensor]: −2 — 2 m/s2

[Longitudinal G Sensor]: −2 — 2 m/s2

[Yaw Rate Sensor]: −4 — 4 deg/s

5

Recheck from step 1, and if the problem is not solved, 8

5. SET 0 POINT SETTING OF LONGITUDINAL G SENSOR USING SUBARU SELECT MONITOR.
1.

Select the [Work Support] using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Work Support

2.

Perform the VDC sensor midpoint setting mode. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>ADJUSTMENT > VDC SENSOR MIDPOINT SETTING MODE

Is 0 point setting successful?

6

Recheck from step 1, and when the 0 point setting is not possible, replace the VDCCM&H/U and steering angle sensor. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) VEHICLE DYNAMICS CONTROL (VDC)>Steering Angle Sensor

6. PERFORM DRIVING TEST.

BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

Does the ABS warning light or VDC warning light illuminate during driving?

Does ABS or VDC operate abnormally?

Recheck from step 1, and when the warning lights illuminate or improperly operate, replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR.
1.

Park the vehicle on a level surface.

2.

Using Subaru Select Monitor, display [Lateral G Sensor], [Longitudinal G Sensor], and [Yaw Rate Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the reading of each sensor following value?

[Lateral G Sensor]: −2 — 2 m/s2

[Longitudinal G Sensor]: −2 — 2 m/s2

[Yaw Rate Sensor]: −4 — 4 deg/s

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

8. CHECK OUTPUT OF SENSORS USING SUBARU SELECT MONITOR.
1.

Remove the VDCCM&H/U installation bolt and bracket.

2.

Keep VDCCM&H/U in a horizontal position.

3.

Using Subaru Select Monitor, display [Lateral G Sensor], [Longitudinal G Sensor], and [Yaw Rate Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

When VDCCM&H/U is in a horizontal position, is the reading of each sensor following value?

[Lateral G Sensor]: −1.5 — 1.5 m/s2

[Longitudinal G Sensor]: −1.5 — 1.5 m/s2

[Yaw Rate Sensor]: −4 — 4 deg/s

Check the bracket and brake pipe, and install VDCCM&H/U in a horizontal position to the vehicle.

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1821 BRAKE TEMPERATURE ABNORMAL

DTC detecting condition:

This code is recorded when the estimated value of temperature under braking is above certain threshold and therefore the conditions for control intervention are met.

Trouble symptom:

- Traction control does not operate.

- Hill descent control does not operate.

- Active torque vectoring does not operate.

1. CHECK DTC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC C1821 a current malfunction?

Stop the vehicle and turn off the engine until the DTC becomes a past malfunction.

It results from a temporal increase in brake temperature. Check the brake pads, disc rotors, and brake fluid.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1831 INSUFFICIENT DECELERATION DURING DYNAMIC PARKING BRAKE OPERATION

DTC detecting condition:

This code is stored when deceleration speed is lower than normal while dynamic parking is operating.

Trouble symptom:

Dynamic parking through the hydraulic control (VDC H/U pressure) does not operate.

1. CHECK DTC.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

3.

Perform the dynamic parking.

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC C1831 a current malfunction?

2

It results from a temporary braking force change.

2. CHECK BRAKE SYSTEM.
1.

Turn the ignition switch to OFF.

2.

Start the engine.

3.

Perform ABS operation check. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>INSPECTION > CHECKING THE HYDRAULIC UNIT VDC OPERATION USING A PRESSURE GAUGE

Is the measured value within the standard value?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Check the brake system.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1921 PARKING POSITION SWITCH CIRCUIT

DTC detecting condition:

- A fault is detected if the switch was positioned at lock or release continuously for 90 seconds while the vehicle is stopped.

- A fault is detected if an irregular switch condition continues for a predetermined period of time immediately after the switch position is changed. A fault is also detected if the switch condition is not confirmed afterwards.

- A fault is detected if the switch harness is open or shorted.

Trouble symptom:

Parking brake system does not operate.

DTC detecting condition:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

1. CHECK OPERATION OF ELECTRONIC PARKING BRAKE.

Operate the parking brake switch.

Does the electronic parking brake operate properly?

- Ask the customer whether the following switch operation was performed.

  - Operated slowly over one second or more.

  - Repeated ON/OFF operation several times within one second.

- When the case above is true, the system is normal.

  When it is normal, a temporary poor contact or noise interference is a possible cause.

2

2. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from the VDCCM&H/U and parking brake switch.

3.

Measure the resistance between VDCCM&H/U and parking brake switch connector.

Connector & terminal

WITHOUT CONSOLE CODE

(B310) No. 15 — (i163) No. 5:

(B310) No. 16 — (i163) No. 4:

(B310) No. 31 — (i163) No. 2:

(B310) No. 32 — (i163) No. 1:

WITH CONSOLE CODE

(B310) No. 15 — (AD67) No. 5:

(B310) No. 16 — (AD67) No. 4:

(B310) No. 31 — (AD67) No. 2:

(B310) No. 32 — (AD67) No. 1:

Is the resistance less than 1 Ω?

3

Repair harness and connector between VDCCM&H/U and parking brake switch connector.

3. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between the parking brake switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 5 — Chassis ground:

(i163) No. 4 — Chassis ground:

(i163) No. 2 — Chassis ground:

(i163) No. 1 — Chassis ground:

Connector & terminal

WITH CONSOLE CODE

(AD67) No. 5 — Chassis ground:

(AD67) No. 4 — Chassis ground:

(AD67) No. 2 — Chassis ground:

(AD67) No. 1 — Chassis ground:

Is the resistance 1 MΩ or more?

4

Repair ground short of harness between VDCCM&H/U and parking brake switch connector.

4. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between parking brake switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 5 (+) — Chassis ground (−):

(i163) No. 4 (+) — Chassis ground (−):

(i163) No. 2 (+) — Chassis ground (−):

(i163) No. 1 (+) — Chassis ground (−):

WITH CONSOLE CODE

(AD67) No. 5 (+) — Chassis ground (−):

(AD67) No. 4 (+) — Chassis ground (−):

(AD67) No. 2 (+) — Chassis ground (−):

(AD67) No. 1 (+) — Chassis ground (−):

Is the voltage less than 1 V?

5

Repair short to power supply of harness between VDCCM&H/U and parking brake switch connector.

5. CHECK PARKING BRAKE SWITCH.

Check the parking brake switch. PARKING BRAKE>Parking Brake Switch>INSPECTION

Is the check result OK?

6

Replace the parking brake switch. PARKING BRAKE>Parking Brake Switch

6. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1923 AUTO VEHICLE HOLD SWITCH CIRCUIT

DTC detecting condition:

A fault is detected if the AVH switch is pressed and held for a long period of time.

Trouble symptom:

AVH function cannot be set.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

1. CHECK POWER SUPPLY OF AVH SWITCH.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the AVH switch.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between the AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 3 (+) — Chassis ground (−):

WITH CONSOLE CODE

(AD67) No. 3 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair the power supply circuit of AVH switch.

2. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance between VDCCM&H/U and AVH switch connector.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 — (B310) No. 43:

WITH CONSOLE CODE

(AD67) No. 8 — (B310) No. 43:

Is the resistance less than 1 Ω?

3

Repair harness and connector between VDCCM&H/U and AVH switch connector.

3. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 — Chassis ground:

WITH CONSOLE CODE

(AD67) No. 8 — Chassis ground:

Is the resistance 1 MΩ or more?

4

Repair ground short of harness between VDCCM&H/U and AVH switch connector.

4. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between the AVH switch connector and chassis ground.

Connector & terminal

WITHOUT CONSOLE CODE

(i163) No. 8 (+) — Chassis ground (−):

WITH CONSOLE CODE

(AD67) No. 8 (+) — Chassis ground (−):

Is the voltage less than 1 V?

5

Repair short to power supply of harness between VDCCM&H/U and AVH switch connector.

5. CHECK AVH SWITCH.

Check the AVH switch. VEHICLE DYNAMICS CONTROL (VDC)>Auto Vehicle Hold Switch>INSPECTION

Is the check result OK?

6

Replace the AVH switch. VEHICLE DYNAMICS CONTROL (VDC)>Auto Vehicle Hold Switch

6. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1935 IGNITION SWITCH CIRCUIT

DTC detecting condition:

A fault is detected after a predetermined period of time, if the hardware IGN signal and CAN IGN signal were compared and did not match.

Trouble symptom:

Electronic parking brake warning light illuminates.

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK VDCCM&H/U INPUT VOLTAGE.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Turn the ignition switch to ON.

4.

Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 36 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

2

Repair or replace the open circuit in the power supply circuit including the fuse.

2. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

3

Repair the VDCCM&H/U ground circuit.

3. CHECK INPUT VOLTAGE OF BODY INTEGRATED UNIT.

Using Subaru Select Monitor, display [IGN voltage] in [Data monitor] of [Body Control]. BODY CONTROL(DIAGNOSTICS)>Data Monitor

Is [IGN voltage] 10 — 15 V?

4

Perform the diagnosis for the body control system. BODY CONTROL(DIAGNOSTICS)>Basic Diagnostic Procedure

4. CHECK LAN SYSTEM.

Read the DTC of the LAN system using the Subaru Select Monitor. LAN SYSTEM (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC for LAN system displayed?

Perform the diagnosis according to the DTC. LAN SYSTEM (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

5

5. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of power supply circuit, ground circuit and VDCCM&H/U connector?

Repair the connector.

6

6. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1942 POWER SUPPLY VOLTAGE

DTC detecting condition:

A fault is detected if low voltage is detected during the electronic parking brake operation.

Trouble symptom:

Parking brake system does not operate sometimes.

Wiring diagram:

Vehicle dynamics control system WIRING SYSTEM>Vehicle Dynamics Control System

1. CHECK BATTERY.
1.

Turn the ignition switch to OFF.

2.

Check the battery voltage. STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION

Is the voltage 10 — 15 V?

2

Charge or replace the battery.

2. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

3

Repair the VDCCM&H/U ground circuit.

3. CHECK VDCCM&H/U INPUT VOLTAGE.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Run the engine at idle.

4.

Measure the voltage between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 30 (+) — Chassis ground (−):

(B310) No. 36 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

4

Repair the power supply circuit.

4. CHECK VDCCM&H/U INPUT VOLTAGE.

Calculate the voltage difference measured in step 1.

A: (B310) No. 30 (+) — Chassis ground (−):

B: (B310) No. 36 (+) — Chassis ground (−):

Is the voltage difference between A and B 2 V or more?

Repair the power supply circuit.

5

5. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of power supply circuit, ground circuit and VDCCM&H/U connector?

Repair the connector.

6

6. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1951 ACTUATOR

DTC detecting condition:

A fault is detected if the electronic parking brake operation status does not match the operation request.

Trouble symptom:

Parking brake system does not operate.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

1. CHECK BATTERY.
1.

Turn the ignition switch to OFF.

2.

Check the battery voltage. STARTING/CHARGING SYSTEMS(H4DO)>Battery>INSPECTION

Is the voltage 10 — 15 V?

2

Charge or replace the battery. Check the generator circuit.

2. CHECK VDCCM&H/U GROUND CIRCUIT (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connector from the VDCCM&H/U.

3.

Measure the resistance between VDCCM&H/U connector and chassis ground.

Connector & terminal

(B310) No. 46 — Chassis ground:

Is the resistance less than 10 Ω?

3

Repair the VDCCM&H/U ground circuit.

3. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from rear brake caliper.

3.

Measure the resistance between VDCCM&H/U and rear brake caliper connector.

Connector & terminal

(B310) No. 2 — (R153) No. 2:

(B310) No. 3 — (R153) No. 1:

(B310) No. 12 — (R154) No. 1:

(B310) No. 13 — (R154) No. 2:

Is the resistance less than 1 Ω?

4

Repair harness and connector between VDCCM&H/U and rear brake caliper connector.

4. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of power supply circuit, ground circuit and VDCCM&H/U connector?

Repair the connector.

5

5. CHECK DRIVER’S DOOR SWITCH.

Check the driver’s door switch. SECURITY AND LOCKS>Door Lock Control System>INSPECTION > CHECK DOOR SWITCH

Is the driver’s door switch normal?

6

Repair the driver’s door switch or circuit.

6. CHECK VDCCM&H/U.
1.

Connect all connectors.

2.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

3.

Set the AVH function to ON.

4.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

7

7. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1954 RH ACTUATOR

DTC detecting condition:

A fault is detected if mechanical sticking or abnormal operation of the rear brake caliper RH is detected.

Trouble symptom:

Parking brake system does not operate.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

1. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from the VDCCM&H/U and rear brake caliper RH.

3.

Measure the resistance between VDCCM&H/U and rear brake caliper RH connector.

Connector & terminal

(B310) No. 2 — (R153) No. 2:

(B310) No. 3 — (R153) No. 1:

Is the resistance less than 1 Ω?

2

Repair harness and connector between VDCCM&H/U and rear brake caliper RH connector.

2. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between the rear brake caliper RH connector and chassis ground.

Connector & terminal

(R153) No. 1 — Chassis ground:

(R153) No. 2 — Chassis ground:

Is the resistance 1 MΩ or more?

3

Repair ground short of harness between VDCCM&H/U and rear brake caliper RH connector.

3. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between the rear brake caliper RH connector and chassis ground.

Connector & terminal

(R153) No. 1 (+) — Chassis ground (−):

(R153) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

4

Repair short to power supply of harness between VDCCM&H/U and rear brake caliper RH connector.

4. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of power supply circuit, ground circuit and VDCCM&H/U connector?

Repair the connector.

5

5. CHECK REAR BRAKE CALIPER.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from rear brake caliper RH.

3.

Measure the resistance between rear brake caliper RH terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 100 Ω?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the parking brake actuator assembly RH. PARKING BRAKE>Parking Brake Actuator

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1955 LH ACTUATOR

DTC detecting condition:

A fault is detected if mechanical sticking or abnormal operation of the rear brake caliper LH is detected.

Trouble symptom:

Parking brake system does not operate.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

1. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from the VDCCM&H/U and rear brake caliper LH.

3.

Measure the resistance between VDCCM&H/U and rear brake caliper LH connector.

Connector & terminal

(B310) No. 12 — (R154) No. 1:

(B310) No. 13 — (R154) No. 2:

Is the resistance less than 1 Ω?

2

Repair harness and connector between VDCCM&H/U and rear brake caliper LH connector.

2. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between the rear brake caliper LH connector and chassis ground.

Connector & terminal

(R154) No. 1 — Chassis ground:

(R154) No. 2 — Chassis ground:

Is the resistance 1 MΩ or more?

3

Repair ground short of harness between VDCCM&H/U and rear brake caliper LH connector.

3. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between the rear brake caliper LH connector and chassis ground.

Connector & terminal

(R154) No. 1 (+) — Chassis ground (−):

(R154) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

4

Repair short to power supply of harness between VDCCM&H/U and rear brake caliper LH connector.

4. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of power supply circuit, ground circuit and VDCCM&H/U connector?

Repair the connector.

5

5. CHECK REAR BRAKE CALIPER.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from rear brake caliper LH.

3.

Measure the resistance between rear brake caliper LH terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 100 Ω?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the parking brake actuator assembly LH. PARKING BRAKE>Parking Brake Actuator

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1956 RH ACTUATOR CIRCUIT

DTC detecting condition:

- A fault is detected, if the motor control mismatch occurs during the motor operation.

- A fault is detected if the motor circuit or harness is open or shorted.

Trouble symptom:

Parking brake system does not operate.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

This DTC may be stored when the rear brake caliper connector is disconnected regardless of the ignition switch condition (ON/OFF). Perform the Clear Memory Mode after diagnosis if a DTC is recorded. COMMON(diag)>Clear memory

1. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from the VDCCM&H/U and rear brake caliper RH.

3.

Measure the resistance between VDCCM&H/U and rear brake caliper RH connector.

Connector & terminal

(B310) No. 2 — (R153) No. 2:

(B310) No. 3 — (R153) No. 1:

Is the resistance less than 1 Ω?

2

Repair harness and connector between VDCCM&H/U and rear brake caliper RH connector.

2. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between the rear brake caliper RH connector and chassis ground.

Connector & terminal

(R153) No. 1 — Chassis ground:

(R153) No. 2 — Chassis ground:

Is the resistance 1 MΩ or more?

3

Repair ground short of harness between VDCCM&H/U and rear brake caliper RH connector.

3. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between the rear brake caliper RH connector and chassis ground.

Connector & terminal

(R153) No. 1 (+) — Chassis ground (−):

(R153) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

4

Repair short to power supply of harness between VDCCM&H/U and rear brake caliper RH connector.

4. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of power supply circuit, ground circuit and VDCCM&H/U connector?

Repair the connector.

5

5. CHECK REAR BRAKE CALIPER.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from rear brake caliper RH.

3.

Measure the resistance between rear brake caliper RH terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 100 Ω?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the parking brake actuator assembly RH. PARKING BRAKE>Parking Brake Actuator

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1957 LH ACTUATOR CIRCUIT

DTC detecting condition:

- A fault is detected, if the motor control mismatch occurs during the motor operation.

- A fault is detected if the motor circuit or harness is open or shorted.

Trouble symptom:

Parking brake system does not operate.

Wiring diagram:

Parking brake / brake fluid level warning light system WIRING SYSTEM>Parking Brake / Brake Fluid Level Warning Light System

This DTC may be stored when the rear brake caliper connector is disconnected regardless of the ignition switch condition (ON/OFF). Perform the Clear Memory Mode after diagnosis if a DTC is recorded. COMMON(diag)>Clear memory

1. CHECK HARNESS (CHECK FOR OPEN CIRCUIT).
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from the VDCCM&H/U and rear brake caliper LH.

3.

Measure the resistance between VDCCM&H/U and rear brake caliper LH connector.

Connector & terminal

(B310) No. 12 — (R154) No. 1:

(B310) No. 13 — (R154) No. 2:

Is the resistance less than 1 Ω?

2

Repair harness and connector between VDCCM&H/U and rear brake caliper LH connector.

2. CHECK HARNESS (CHECK FOR GROUND SHORT CIRCUIT).

Measure the resistance between the rear brake caliper LH connector and chassis ground.

Connector & terminal

(R154) No. 1 — Chassis ground:

(R154) No. 2 — Chassis ground:

Is the resistance 1 MΩ or more?

3

Repair ground short of harness between VDCCM&H/U and rear brake caliper LH connector.

3. CHECK HARNESS (CHECK FOR SHORT CIRCUIT TO POWER SUPPLY).
1.

Turn the ignition switch to ON.

2.

Measure the voltage between the rear brake caliper LH connector and chassis ground.

Connector & terminal

(R154) No. 1 (+) — Chassis ground (−):

(R154) No. 2 (+) — Chassis ground (−):

Is the voltage less than 1 V?

4

Repair short to power supply of harness between VDCCM&H/U and rear brake caliper LH connector.

4. CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of power supply circuit, ground circuit and VDCCM&H/U connector?

Repair the connector.

5

5. CHECK REAR BRAKE CALIPER.
1.

Turn the ignition switch to OFF.

2.

Disconnect the connectors from rear brake caliper LH.

3.

Measure the resistance between rear brake caliper LH terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 100 Ω?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Replace the parking brake actuator assembly LH. PARKING BRAKE>Parking Brake Actuator

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1983 HIGH FREQUENCY OPERATION

DTC detecting condition:

This malfunction is stored if the electronic parking brake is operated with high frequency in a short period of time.

Trouble symptom:

Parking brake system does not operate sometimes.

1. CHECK OUTPUT OF AMBIENT SENSOR USING SUBARU SELECT MONITOR.

Using Subaru Select Monitor, display [Ambient Temp Sensor] of [Data Monitor]. BRAKE CONTROL (DIAGNOSTICS)>Data Monitor

Is the reading of [Ambient Temp Sensor] within the range of ±10°C to the ambient temperature?

2

Repair the ambient sensor circuit.

2. CHECK VDCCM&H/U.
1.

Turn the ignition switch to OFF.

2.

Stop the vehicle for approximately one hour.

3.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

4.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

5.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is the same DTC displayed?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

3

3. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to the DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1984 BRAKE MAINTENANCE MODE

DTC detecting condition:

This malfunction is stored when the brake maintenance mode is in progress.

Trouble symptom:

Parking brake system does not operate.

When any other DTC is detected, start the diagnosis with the DTC.

1. CHECK ELECTRONIC PARKING MODE.

Is the brake maintenance mode in progress?

Currently, it is normal. Although DTC C1984 is input during the brake maintenance mode, it is normal. PARKING BRAKE>Parking Brake System>OPERATION > BRAKE MAINTENANCE MODE

2

2. CHECK OPERATION OF ELECTRONIC PARKING BRAKE.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Apply the electronic parking brake several times.

3.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is DTC stored even though the electronic parking brake does not operate or the electronic parking brake operates?

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

3

3. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

Perform the diagnosis from step 1 again, and if the same DTC is stored, replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC C1985 FORBIDDEN STATE OF DYNAMIC ACTUATOR OPERATION

DTC detecting condition:

This malfunction is stored if dynamic parking through the electronic parking brake actuator does not operate.

Trouble symptom:

Parking brake system does not operate.

1. CHECK DETECTION OF OTHER DTCS FOR VDC.

Read the DTC using Subaru Select Monitor. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

Is any other DTC displayed?

- Perform the diagnosis according to DTC. BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)>LIST

- This DTC is stored for other malfunctions.

2

2. CHECK OPERATION OF ELECTRONIC PARKING BRAKE.
1.

Using the Subaru Select Monitor, perform the clear memory. COMMON(diag)>Clear memory

2.

Execute the inspection mode. BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode

Does it operate properly?

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

Replace the VDCCM&H/U. VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A"

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0101 LOST COMMUNICATION WITH TCM

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0126 LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A"

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0402 INVALID DATA RECEIVED FROM TCM

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U0428 INVALID DATA RECEIVED FROM STEERING ANGLE SENSOR MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U1120 LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U1235 LOST COMMUNICATION WITH EyeSight

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U1433 INVALID DATA RECEIVED FROM EyeSight

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC U1469 INVALID DATA RECEIVED FROM AUTOSTART STOP CONTROL MODULE

Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure

BRAKE CONTROL (DIAGNOSTICS) > General Diagnostic Table
INSPECTION

Symptoms | Main probable cause | Other probable cause
Poor brake performance | Long braking/stopping distance | VDCCM&H/U Brake pad Aeration to brake line Tire specifications, tire wear and air pressures Incorrect wiring or piping connections | Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Master cylinder Brake caliper Disc rotor Brake pipe Brake booster
Wheel lock | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Incorrect wiring or piping connections | Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake caliper Brake pipe
Brake drag | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Master cylinder Brake caliper Parking brake Axle and wheels Brake pedal play | Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake pad Brake pipe
Long brake pedal stroke | Aeration to brake line Brake pedal play | VDCCM&H/U Master cylinder Brake caliper Brake pad Brake pipe Brake booster
Vehicle vertical pitching | VDCCM&H/U Road surface (uneven) Suspension play or fatigue (reduced damping) Incorrect wiring or piping connections | Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U.
Poor brake performance | Unstable or uneven braking | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Brake caliper Brake pad Road surface (uneven) Tire specifications, tire wear and air pressures Incorrect wiring or piping connections | Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Master cylinder Disc rotor Brake pipe Axle and wheels Road with crowns or banks Suspension play or fatigue (reduced damping)
Vibration or noise When braking suddenly When accelerating rapidly While driving on a slippery road | Excessive brake pedal vibration | Road surface (uneven) Incorrect wiring or piping connections | VDCCM&H/U Brake booster Suspension play or fatigue (reduced damping)
Noise from VDCCM&H/U | VDCCM&H/U (mount bushing) Defective ABS wheel speed sensor or sensor gap Brake pipe | VDCCM&H/U Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U.
Noise from the front side of vehicle | VDCCM&H/U (mount bushing) Defective ABS wheel speed sensor or sensor gap Master cylinder Brake caliper Brake pad Disc rotor Brake pipe Brake booster Suspension play or fatigue (reduced damping) | Axle and wheels Tire specifications, tire wear and air pressures
Noise from the rear side of vehicle | Defective ABS wheel speed sensor or sensor gap Brake caliper Brake pad Disc rotor Parking brake Brake pipe Suspension play or fatigue (reduced damping) | Axle and wheels Tire specifications, tire wear and air pressures
Engine does not accelerate or goes into a stall when accelerating suddenly or driving on a slippery surface. | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Master cylinder Brake caliper Parking brake Incorrect wiring or piping | Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake pad Brake pipe
Poor change-direction-operation stability of TCS | Deviation to right or left direction | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake caliper Brake pad Wheel alignment Road surface (uneven) Road with crowns or banks Tire specifications, tire wear and air pressures Incorrect wiring or piping connections | Disc rotor Brake pipe Axle and wheels Suspension play or fatigue (reduced damping)
Vehicle spin | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Brake pad Tire specifications, tire wear and air pressures Incorrect wiring or piping connections | Brake caliper Brake pipe
Steering wheel drag while driving | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Incorrect wiring or piping connections Power steering system | Brake caliper Brake pad Disc rotor Wheel alignment Road surface (uneven) Road with crowns or banks Suspension play or fatigue (reduced damping) Tire specifications, tire wear and air pressures
VDC operates while driving normally. | VDCCM&H/U Defective ABS wheel speed sensor or sensor gap Defective steering angle sensor or improper neutral position Defective yaw rate & G sensor or improper installation of VDCCM&H/U. Wheel alignment Road surface (uneven) Road with crowns or banks Suspension play or fatigue (reduced damping) Tire specifications, tire wear and air pressures Incorrect wiring or piping connections Power steering system |
VDC OFF indicator light does not illuminate when the VDC OFF switch is depressed. When pressing VDC OFF switch for 30 seconds or more, VDC OFF indicator light goes off and cannot operate any more. When turning the ignition switch from OFF to ON, the previous status is restored. | Harness Combination meter VDC OFF switch |
Electronic parking brake warning light illuminates. | Parking brake system does not operate. | Defective parking brake switch Malfunction in VDCCM&H/U Defective CAN communication |
AVH function and accelerator interlocking release function do not operate. | Defective AVH switch Malfunction signal reception from ECM Malfunction signal reception from TCM Faulty signal received from VDC control module Defective parameter selection for VDCCM&H/U CAN signal not received from ECM CAN signal not received from TCM CAN signal not received from body integrated unit Defective longitudinal G sensor |
When the AVH function is set to ON, drugging of brake may occur when the vehicle starts to move. | — | Driver’s seat belt is not fastened.