( TL19E00J54200000000BBAT00 )

How to Troubleshoot the Body Electrical

Tips and Precautions
Before Troubleshooting

1. Check applicable fuses in the appropriate fuse/relay box.

1. Check the battery for damage, state of charge, and clean and tight connections.
   - Do not quick-charge a battery unless the battery ground cable has been disconnected, otherwise you will damage the alternator diodes.
   - Do not attempt to crank the engine with the battery ground cable loosely connected or you will severely damage the wiring.

Handling Connectors

- Make sure the connectors are clean and have no loose wire terminals.
- Make sure multiple cavity connectors are packed with dielectric grease (except watertight connectors).
- All connectors have push-down release type locks (A).

- Some connectors have a clip on their side used to attach them to a mount bracket on the body or on another component. This clip has a pull type lock.
- Some mounted connectors cannot be disconnected unless you first release the lock and remove the connector from its mount bracket (A).

- Never try to disconnect connectors by pulling on their wires; pull on the connector halves instead.
- Always reinstall plastic covers.

- Before connecting connectors, make sure the terminals (A) are in place and not bent.

- Check for loose retainer (A) and rubber seals (B).

- The backs of some connectors are packed with dielectric grease. Add grease if necessary. If the grease is contaminated, replace it.

- Insert the connector all the way and make sure it is securely locked.
- Position wires so that the open end of the cover faces down.

Handling Wires and Harnesses

- Secure wires and wire harnesses to the frame with their respective wire ties at the designated locations.
- Remove clips carefully; don't damage their locks (A).

- After installing harness clips, make sure the harness doesn't interfere with any moving parts.
- Keep wire harnesses away from exhaust components and other hot parts, from sharp edges of brackets and holes, and from exposed screws and bolts.
- Seat grommets in their grooves properly (A). Do not leave grommets distorted (B).

Testing and Repairs

- Do not use wires or harnesses with broken insulation. Replace them or repair them by wrapping the break with electrical tape.
- Never attempt to modify, splice, or repair SRS wiring. If there is an open or damage is SRS wiring or terminals, replace the harness.
- After installing parts, make sure that no wires are pinched under them.
- When using electrical test equipment, follow the manufacturer's instructions and those described in this manual.
- If possible, insert the probe of the tester from the wire side (except waterproof connector).

- Use back probe adaptor 07TAZ-001020A.

- Refer to the instructions in the Honda Terminal Kit for identification and replacement of connector terminals.

Five-step Troubleshooting

1. Verify The Complaint:
   Turn on all the components in the problem circuit to verify the customer complaint. Note the symptoms. Do not begin disassembly or testing until you have narrowed down the problem area.

1. Analyze The Schematic:
   Look up the schematic for the problem circuit. Determine how the circuit is supposed to work by tracing the current paths from the power feed through the circuit components to ground. If several circuits fail at the same time, the fuse or a ground is a likely cause.
   Based on the symptoms and your understanding of the circuit operation, identify one or more possible causes of the problem.

1. Isolate The Problem By Testing The Circuit:
   Make circuit tests to check the diagnosis you made in Step 2 . Keep in mind that a logical, simple procedure is the key to efficient troubleshooting. Test for the most likely cause of failure first. Try to make tests at points that are easily accessible.

1. Fix The Problem:
   Once the specific problem is identified, make the repair. Be sure to use proper tools and safe procedures.

1. Make Sure The Circuit Works:
   Turn on all components in the repaired circuit in all modes to make sure you've fixed the entire problem. If the problem was a blown fuse, be sure to test all of the circuits on the fuse. Make sure no new problems turn up and the original problem does not recur.

Wire Color Codes
The following abbreviations are used to identify wire colors in the circuit schematics:

WHT. | White
YEL. | Yellow
BLK. | Black
BLU. | Blue
GRN. | Green
RED. | Red
ORN. | Orange
PNK. | Pink
BRN. | Brown
GRY. | Gray
PUR. | Purple
LT BLU. | Light Blue
LT GRN. | Light Green

The wire insulation has one color or one color with another color stripe. The second color is the stripe.

Troubleshoot the B-CAN Circuit Related Problems
How to check for DTCs with the HDS (preferred method)
The HDS can check the F-CAN and B-CAN communication status, read and clear the DTCs, display the data list, and perform function test.
Check for DTCs

1. Connect the HDS to the data link connector (A) located under the driver's side of the dashboard.

1. Turn the ignition switch to ON (II).

1. Make sure the HDS communicates with vehicle.
   NOTE: If the HDS does not communicate with the vehicle, troubleshoot the DLC circuit.
   - R20A3 engine
   - K24Z3 engine

1. Select the BODY ELECTRICAL, then select the desired TEST MODE menu, and check the DTCs. If the DTCs do not pertain to the select menu, select the All DTC Check icon to view all Body DTCs.
   NOTE: For specific operations, refer to the HDS user's manual.

1. If any DTCs are indicated, go to the indicated DTCs troubleshooting.
   NOTE: If the DTC U1280 is stored, troubleshoot the DTC U1280 first.

Troubleshoot the B-CAN Circuit Related Problems
How to check for DTCs with the HDS (preferred method)
The HDS can check the F-CAN and B-CAN communication status, read and clear the DTCs, display the data list, and perform function test.
Check for DTCs

1. Connect the HDS to the data link connector (A) located under the driver's side of the dashboard.

1. Turn the ignition switch to ON (II).

1. Make sure the HDS communicates with vehicle.
   NOTE: If the HDS does not communicate with the vehicle, troubleshoot the DLC circuit.
   - R20A3 engine
   - K24Z3 engine

1. Select the BODY ELECTRICAL, then select the desired TEST MODE menu, and check the DTCs. If the DTCs do not pertain to the select menu, select the All DTC Check icon to view all Body DTCs.
   NOTE: For specific operations, refer to the HDS user's manual.

1. If any DTCs are indicated, go to the indicated DTCs troubleshooting.
   NOTE: If the DTC U1280 is stored, troubleshoot the DTC U1280 first.

How to check for DTCs without the HDS (Use only if the HDS is unavailable)
Special Tools Required
MPCS short connector
07WAZ-0010100
If the HDS is unavailable, using the following method, you can check the B-CAN communication status, DTCs, and some F-CAN communication status related with the gauge control module.
Check for DTCs

1. Turn the ignition switch to ON (II).

1. Connect the MPCS short connector (A) to the MICU service check connector (B), and turn the switch (C) ON.

How to check for DTCs without the HDS (Use only if the HDS is unavailable)
Special Tools Required
MPCS short connector
07WAZ-0010100
If the HDS is unavailable, using the following method, you can check the B-CAN communication status, DTCs, and some F-CAN communication status related with the gauge control module.
Check for DTCs

1. Turn the ignition switch to ON (II).

1. Connect the MPCS short connector (A) to the MICU service check connector (B), and turn the switch (C) ON.

1. After 5 to 10 seconds, the DTCs which have been detected and stored individually by various B-CAN unit, will be indicates one by one on the odo/trip display if the communication line between the driver's MICU and the gauge control module is OK. To scroll through the DTCs, press the select/reset button.

The unit that has stored the code can be identified by the number shown on the odometer display.

Control Unit | Control Unit I.D. Number
--- | ---
Driver's MICU | 13
Passenger's MICU | 14
Door multiplex control unit | 30
Gauge control module | 50
Heater control unit/Climate control unit | 51
Automatic lighting/rain sensor | 71
Headlight leveling control unit | 75
Hands Free Telephone control unit | 94
Parking and back-up sensor control unit | 9A
Power seat control unit | 95
Immobilizer-keyless control unit | 96

NOTE: Also you can check the B-CAN communication status by following methods:

- The MICU self-diagnostic function Test Mode 1 and Test Mode 2 can check some communication status and some switch circuits.
- The gauge control module self-diagnostic function can check the communication status.

1. After 5 to 10 seconds, the DTCs which have been detected and stored individually by various B-CAN unit, will be indicates one by one on the odo/trip display if the communication line between the driver's MICU and the gauge control module is OK. To scroll through the DTCs, press the select/reset button.

The unit that has stored the code can be identified by the number shown on the odometer display.

Control Unit | Control Unit I.D. Number
--- | ---
Driver's MICU | 13
Passenger's MICU | 14
Door multiplex control unit | 30
Gauge control module | 50
Heater control unit/Climate control unit | 51
Automatic lighting/rain sensor | 71
Headlight leveling control unit | 75
Hands Free Telephone control unit | 94
Parking and back-up sensor control unit | 9A
Power seat control unit | 95
Immobilizer-keyless control unit | 96

NOTE: Also you can check the B-CAN communication status by following methods:

- The MICU self-diagnostic function Test Mode 1 and Test Mode 2 can check some communication status and some switch circuits.
- The gauge control module self-diagnostic function can check the communication status.

How to Clear the DTCs with the HDS

1. Connect the HDS to the data link connector (A) located under the driver's side of the dashboard.

1. Turn the ignition switch to ON (II).

1. Clear the DTCs with the HDS.

1. Turn the ignition switch to LOCK (0), and disconnect the HDS from the data link connector (DLC).

How to Clear the DTCs without the HDS

1. While in DTCs indication status, press and hold the SELECT/RESET switch for more than 10 seconds.

1. Turn the MPCS short connector switch off, and disconnect the connector from the MICU service check connector.

1. Turn the ignition switch to LOCK (0).

HDS Inputs and Commands
Certain inputs happen so quickly that the HDS can not update fast enough. Hold the switch that is being tested while monitoring the Data List. This should give the HDS time to update the signal on the Data List. Because the HDS software is updated to support the release for newer vehicles it is not uncommon to see system function tests that are not supported. Make sure that the most current software is loaded.
Input:

System Menu | Data List | Data List Indication
--- | --- | ---
Gauge | Cruise Control Main Switch (ACC switch) | OFF/ON
Cruise Control Set Switch | OFF/ON
Cruise Control Resume Switch | OFF/ON
VSA/TCS Off Switch | OFF/ON
Gauge Select/Reset Switch | OFF/ON
Parking Brake Switch | OFF/ON
Brake Fluid Level Switch | OFF/ON
Fuel Sending Unit Input 1 | deg
Fuel Sending Unit Input 2 | V
VSA/TCS Active Indicator | OFF/ON
VSA/TCS Indicator (Warning) | OFF/ON
ABS Indicator | OFF/ON
EBD Indicator (Electronic Brake Distribution) | OFF/ON
Cruise Control Main Switch Indicator | OFF/ON
MIL Indicator | OFF/ON
Low Oil Pressure Indicator | OFF/ON
Charging System Indicator | OFF/ON
CRUISE Main Switch Lamp | OFF/ON
High Beam Indicator | OFF/ON
Parking Light ON Indicator | OFF/ON
Low Fuel Warning Indicator | OFF/ON
Security Indicator | OFF/ON
Fog Light Indicator | OFF/ON
Auto-Light Trouble Lamp | OFF/ON
Seat Belt Indicator | OFF/ON
Speed Indicator (km/h) Command | km/h
Speed Indicator (mph) Command | mile/h

HDS Inputs and Commands
Input:

System Menu | Data List | Data List Indication
--- | --- | ---
Lighting | Passing Input Signal | OFF/ON
Headlight ON Input Signal | OFF/ON
Driver's Door Switch | OFF/ON
Hazard Switch | OFF/ON
Headlight Switch (OFF) | OFF/ON
Headlight Switch (PARKING) | OFF/ON
Headlight Switch (HEADLIGHT) | OFF/ON
Headlight Switch (AUTO) | OFF/ON
Headlight Switch (High Beam) | OFF/ON
Headlight Switch (PASSING) | OFF/ON
Turn Signal Switch (LEFT) | OFF/ON
Turn Signal Switch (RIGHT) | OFF/ON
Fog Light Switch | OFF/ON
Rear Fog Light Switch | OFF/ON
Interior Light Command | OFF/ON
Left Turn Signal Command | OFF/ON
Right Turn Signal Command | OFF/ON
Rear Fog Light Command | OFF/ON
DR Courtesy Light Output | OFF/ON
RD Courtesy Light Output | OFF/ON
Headlight Command | OFF/ON
Headlight High Beam Command | OFF/ON
Parking Light Command | OFF/ON
Fog Light Command | OFF/ON
Autolight Sensor Input Voltage | V
Autolight Sensor Malfunction Detection Voltage Max | V
Autolight Sensor Malfunction Detection Voltage Min | V
Headlight Cleaner Command | OFF/ON
Autolight Small Command | OFF/ON
Autolight Headlight Command | OFF/ON
Autolight Warning Command | OFF/ON
Autolight Headlight Backup Line Command | OFF/ON
AS Courtesy Light Output | OFF/ON
RA Courtesy Light Output | OFF/ON

HDS Inputs and Commands
Input:

System Menu | Data List | Data List Indication
--- | --- | ---
Door Locks | Driver's Door Key Cylinder Switch (LOCK) | OFF/ON
Driver's Door Key Cylinder Switch (UNLOCK) | OFF/ON
Driver's Door Lock Switch (LOCK) | OFF/ON
Driver's Door Lock Switch (UNLOCK) | OFF/ON
Driver's Door Lock Knob Switch (LOCK) | OFF/ON
Driver's Door Lock Knob Switch (UNLOCK) | OFF/ON
Driver's Door Switch | OFF/ON
Driver's Rear Door Switch | OFF/ON
Driver's Rear Door Lock Knob Switch (UNLOCK) | OFF/ON
Door LOCK Command | OFF/ON
Door UNLOCK Command | OFF/ON
Driver's Door UNLOCK Command | OFF/ON
Front Passenger's Door Switch | OFF/ON
Passenger's Rear Door Switch | OFF/ON
Passenger's Rear Door Lock Knob Sw. (UNLOCK) | OFF/ON
Door LOCK Command | OFF/ON
Door UNLOCK Command | OFF/ON

HDS Inputs and Commands
Input:

System Menu | Data List | Data List Indication
--- | --- | ---
Keyless | Driver's Door Key Cylinder Switch (LOCK) | OFF/ON
Driver's Door Key Cylinder Switch (UNLOCK) | OFF/ON
Driver's Door Lock Switch (LOCK) | OFF/ON
Driver's Door Lock Switch (UNLOCK) | OFF/ON
Driver's Door Lock Knob Switch (LOCK) | OFF/ON
Driver's Door Lock Knob Switch (UNLOCK) | OFF/ON
Driver's Door Switch | OFF/ON
Driver's Rear Door Switch | OFF/ON
Trunk Lid/Tailgate Switch | OFF/ON
Driver's Rear Door Lock Knob Switch (UNLOCK) | OFF/ON
Door LOCK Command | OFF/ON
Door UNLOCK Command | OFF/ON
Driver's Door UNLOCK Command | OFF/ON
Trunk Lid Release Command | OFF/ON
Front Passenger's Door Switch | OFF/ON
Passenger's Rear Door Switch | OFF/ON
Passenger's Rear Door Lock Knob Sw. (UNLOCK) | OFF/ON
Door LOCK Command | OFF/ON
Door UNLOCK Command | OFF/ON
Power Windows | P/W Main Switch | OFF/ON
P/W Master Switch (Driver's Window AUTO) | OFF/ON
P/W Master Switch (Driver's Window UP) | OFF/ON
P/W Master Switch (Driver's Window DOWN) | OFF/ON
P/W Master Sw. (Front Passenger's Window UP) | OFF/ON
P/W Master Sw. (Front Passenger's Window DOWN) | OFF/ON
P/W Master Switch (Left Rear Window UP) | OFF/ON
P/W Master Switch (Left Rear Window DOWN) | OFF/ON
P/W Master Sw. (Right Rear Window UP) | OFF/ON
P/W Master Sw. (Right Rear Window DOWN) | OFF/ON
P/W Master Sw. (Passenger's Window AUTO) | OFF/ON
Driver's P/W Motor Pulse A | NOT EXIST/EXIST
Driver's P/W Motor Pulse B | NOT EXIST/EXIST
Driver's P/W Motor Command | OFF/UP/DOWN
Driver's Door Switch | OFF/ON
Power Window Timer Output | OFF/ON
Front Passenger's Door Switch | OFF/ON
Power Window Timer Output | OFF/ON

HDS Inputs and Commands
Input:

System Menu | Data List | Data List Indication
--- | --- | ---
Wipers | Rain Sensing Information | Normal condition, Need to check, System error warning
Brake Pedal Position Switch | OFF/ON
Windshield Wiper Switch (LOW) | OFF/ON
Windshield Wiper Switch (HIGH) | OFF/ON
Windshield Wiper Switch (MIST) | OFF/ON
Windshield Wiper Switch (INT) | OFF/ON
Windshield Washer Switch | OFF/ON
Windshield Wiper Motor PARK Switch | OFF/ON
Windshield Wiper Motor HI Command | OFF/ON
Windshield Wiper Motor LO Command | OFF/ON
Headlight Washer switch | OFF/ON
Windshield Washer Motor Command | OFF/ON
Security | Driver's Door Key Cylinder Switch (LOCK) | OFF/ON
Driver's Door Key Cylinder Switch (UNLOCK) | OFF/ON
Driver's Door Lock Switch (LOCK) | OFF/ON
Driver's Door Lock Switch (UNLOCK) | OFF/ON
Driver's Door Lock Knob Switch (LOCK) | OFF/ON
Driver's Door Lock Knob Switch (UNLOCK) | OFF/ON
Ignition Key Cylinder Switch | OFF/ON
Driver's Door Switch | OFF/ON
Driver's Rear Door Switch | OFF/ON
Trunk Lid/Tailgate Switch | OFF/ON
Driver's Rear Door Lock Knob Switch (UNLOCK) | OFF/ON
Radio Switch | OFF/ON
Hazard Switch | OFF/ON
Hood Switch | OFF/ON
Door LOCK Command | OFF/ON
Door UNLOCK Command | OFF/ON
Driver's Door UNLOCK Command | OFF/ON
Trunk Lid Release Command | OFF/ON
Headlight Command | OFF/ON
Headlight High Beam Command | OFF/ON
Parking Light Command | OFF/ON
Horn Command | OFF/ON
Front Passenger's Door Switch | OFF/ON
Passenger's Rear Door Switch | OFF/ON
Passenger's Rear Door Lock Knob Sw. (UNLOCK) | OFF/ON
Radio Switch | OFF/ON
Door LOCK Command | OFF/ON
Door UNLOCK Command | OFF/ON
Headlight Command | OFF/ON
Headlight High Beam Command | OFF/ON
Parking Light Command | OFF/ON

HDS Inputs and Commands
Input:

System Menu | Data List | Data List Indication
--- | --- | ---
Climate control | A/C Pressure Switch/Thermal Protector | OFF/ON
Rear Defroster Input Switch | OFF/ON
Rear Defroster Output Switch | OFF/ON
Headlight leveling | Front Height Sensor Value |
Rear Height Sensor Value |
Adjust Sensor Value |
Height Sensor Minimum Value |
Height Sensor Maximum Value |
Passing Input Signal | OFF/ON
Headlight ON Input Signal | OFF/ON
Vehicle Speed Input Signal | OFF/ON
Auto Leveling Warning Command | OFF/ON
Height Sensor Input Signal | OFF/ON
Adjust Output Signal | OFF/ON
Auto Light Leveling Calibration Completion Command |

Output:

System Menu | HDS Description | Note
--- | --- | ---
Climate control | Rear defroster RLY | Outputs for 60 seconds
Rear Defogger | Operates a relay of Rear defroster for 60 seconds
Headlight leveling | The reflector is moved one time up and down | The reflector is moved one time up and down
Warning lamp | Warning lamp
Door locks | LOCK all doors | Outputs LOCK signal 1 time (0.6 sec) to all door
UNLOCK all doors | Outputs UNLOCK signal 1 time (0.6 sec) to all door
UNLOCK driver's side door | Outputs UNLOCK signal 1 time (0.6 sec) to driver side door
Keyless | Trunk Lid/Tailgate Release Command | Unlock trunk
Lighting | Interior Light Command | Illuminates for 30 seconds
Hazard flasher (Turn left and right) | Blinks turn signal (left and right) for 15 seconds
LEFT Turn Signal Command | Blinks for 5 seconds
RIGHT Turn Signal Command | Blinks for 5 seconds
Headlight Command | Operates headlight (low) for 15 seconds
Headlight HIGH Beam Command | Operates headlight (high) for 15 seconds
Fog Light | Operates a relay of front fog light for 15 seconds
Courtesy light (DR) | Illuminates for 30 seconds
Small light | Operates small lights for 15 seconds
Courtesy LT RD | Outputs for 30 seconds
Rear Fog Light | Illuminates for 30 seconds
Headlight Backup | Outputs for 15 milliseconds
Headlight Cleaner | Outputs operation 1 time (for 750 milliseconds)
Courtesy light (AS) | Illuminates for 30 seconds
Courtesy LT RA | Outputs for 30 seconds
Headlight Command | Operates for 15 seconds
Headlight HIGH Beam Command | Operates for 15 seconds
Parking Light Command | Operates for 15 seconds
Fog Light | Operates for 15 seconds
Rear Fog Lamp | Illuminates for 30 seconds
Cargo Area Light | Illuminates for 30 seconds
Power windows | Power window RLY Rr | Outputs for 30 seconds
Power window RLY Rr | Outputs for 30 seconds
Driver's Window Up | Drives for 3 seconds
Driver's Window Down | Drives for 3 seconds
Front Passenger's Window Up | Drives for 3 seconds
Front Passenger's Window Down | Drives for 3 seconds
Left Rear Window Up | Drives for 3 seconds
Left Rear Window Down | Drives for 3 seconds
Right Rear Window Up | Drives for 3 seconds
Right Rear Window Down | Drives for 3 seconds
Security | Horn Command | Operates horn for 1 second
Horn Command | Operates horn for 1 second
Wiper | Windshield Wiper Motor LOW Command | Operates windshield wiper for 5 seconds (low speed)
Windshield Wiper Motor HIGH Command | Operates windshield wiper for 5 seconds (high speed)
Windshield Washer Command | Operates windshield washer for 5 seconds
Windshield Wiper Motor LOW Command | Operates windshield wiper for 5 seconds (low speed)
Windshield Wiper Motor HIGH Command | Operates windshield wiper for 5 seconds (high speed)
Windshield Washer Command | Operates windshield washer for 5 seconds
Auto Wiper Test | Outputs intermittent wiper signal (1 time)
Driving position memory system | Power Seat: Slide Motor-Full FORWARD |
Power Seat: Slide Motor-Full BACKWARD |
Power Seat: Front UP-DOWN Motor-Full UP |
Power Seat: Front UP-DOWN Motor-Full DOWN |
Power Seat: Rear UP-DOWN Motor-Full UP |
Power Seat: Rear UP-DOWN Motor-Full DOWN |
Power Seat: Recline Motor-Full FORWARD |
Power Seat: Recline Motor-Full BACKWARD |
Power Seat: Memory Buzzer-5 seconds |

When an ECU is unable to communicate with the other ECUs on the CAN circuit, the other control units will set loss of communication DTCs. Use this chart to find the control unit that is not communicating.

1. Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs retrieved.

1. Do the input test for the transmitting control unit.

BUS OFF and Internal Error Codes

DTC type | Related Unit
--- | ---
Drive's MICU | Passenger's MICU | Gauge control module | Door multiplex control unit | Immobilizer-keyless control unit | Heater control unit/ Climate control unit | Headlight leveling control unit | Automatic lighting/Rain sensor | Power seat control unit | Hands Free Telephone control unit | Parking and back-up sensor control unit
BUS OFF | U1280 | U1280 | U1280 | U1280 | U1280 | U1280 | U1280 | U1280 | U1280 | U1280 | U1280
ECU (EEPROM) Error | B10A2 | B11A2 | B1152 |  |  |  |  |  |  |  |
Driver's MICU | TX | U1282 | U1282 | U1282 | U1282 |  | U1282 | U1282 |  | U1282 | U1282
Passenger's MICU | U1283 | TX | U1283 | U1283 |  |  |  |  |  |  |
Gauge control module | U0155 | U0155 | TX | U0155 | U0155 | U0155 | U0155 |  | U0155 | U0155 |
Door multiplex control unit | U0199 |  |  | TX | U0199 |  |  |  |  |  |
Heater control unit/ Climate control unit |  |  |  | U0164 |  | TX |  |  | TX |  |
ECM/PCM |  |  | U0100 |  |  |  |  |  |  |  |
SRS unit |  |  | U0151 |  |  |  |  |  |  |  |
ACC control unit |  |  | U0104 |  |  |  |  |  |  |  |
VSA modulator-control unit |  |  | U0122 |  |  |  |  |  |  |  |
EPS control unit |  |  | U0131 |  |  |  |  |  |  |  |

TX: | Transmitting unit does not set a loss of communication DTC.

NOTE: In order for the driver's MICU to verify the communication with the rain sensor (with automatic wiper), after the battery terminal(s) have been disconnected, connect the rain sensor 6P connector before reconnecting the battery terminal(s) and turn the ignition switch ON (II). Since only the rain sensor is determined equipped or unequipped by the presence of communication, when the connector is disconnected, even the equipped vehicle is determined as unequipped.