CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

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CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER]

B3E074061190W07

1. Turn the ignition switch to the ON position.

2. Connect the negative (-) lead of the tester to body ground.

3. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table.

  • If there is any malfunction, inspect the parts under "Inspection item (s)".

  - If the parts under "Inspection item (s)" are found to be normal (except for terminal F), replace the climate control unit.
  - For terminal F, first try replacing the power MOS FET. If there is still any malfunction, replace the climate control unit.

## Terminal Voltage Table (Reference)

Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item (s)
--- | --- | --- | --- | --- | ---
A | TNS signal | PJB | Headlight switch OFF | 1.0 or less | • Wiring harness: short circuit (Climate control unit-PJB: A-J-03 H) • Panel light control switch • Headlight switch
Headlight switch ON | B+ | • Wiring harness: continuity, short circuit (Climate control unit-PJB: A-J-03 H) • Panel light control switch • Headlight switch
B | TNS signal | Panel light control switch | Headlight switch ON and panel light control switch at max. illumination | 1.0 or less | • Wiring harness: continuity (Climate control unit-panel light control switch: B-F) • Panel light control switch • Climate control unit: terminal voltage (A)
Headlight switch ON and panel light control switch at min. illumination | 12 | • Wiring harness: short circuit (Climate control unit-panel light control switch: B-F)
C | Motor operation | Air mix actuator | Moving towards COLD | 12 | • Wiring harness: continuity, short circuit (Climate control unit-air mix actuator: C-D, E-F) • Air mix actuator
Moving towards HOT | 1.0 or less
D | Blower fan speed control | Power MOS FET | Fan stopped | 1.0 or less | • Climate control unit: terminal voltage (F)
Fan: manual LO | 2.9
Fan: manual HI | 9.7
E | Motor operation | Air mix actuator | Moving towards COLD | 1.0 or less | • Wiring harness: continuity, short circuit (Climate control unit-air mix actuator: E-F, C-D) • Air mix actuator
Moving towards HOT | 12

F

Blower motor feedback

• Blower motor
• Power MOS FET

Fan stopped

B+

1. Wiring harness: continuity, short circuit (Climate control unit-blower motor: F-B) (Climate control unit-power MOS FET: F-B, D-C) (Blower motor-blower relay: A-E) (Blower relay-fuse: A-HEATER 40 A, B-A/C 10 A)
2. Wiring harness: continuity (Power MOS FET-body ground: A-GND) (Blower relay-body ground: D-GND)
3. Power MOS FET
4. Blower motor
5. Blower relay
6. A/C 10 A fuse
7. HEATER 40 A fuse
8. Power MOS FET replacement

Fan: manual LO | 9.8
Fan: manual HI | 0.5
G | Motor operation | Airflow mode actuator | Switched to DEFROSTER | 12 | • Wiring harness: continuity, short circuit (Climate control unit-airflow mode actuator: G-F, I-D) • Airflow mode actuator
Switched to VENT | 1.0 or less
H | - | - | - | - | -
I | Motor operation | Airflow mode actuator | Switched to DEFROSTER | 1.0 or less | • Wiring harness: continuity, short circuit (Climate control unit-airflow mode actuator: I-D, G-F) • Airflow mode actuator
Switched to VENT | 12
J | B+ | ROOM 15 A fuse | Under any condition | B+ | • Wiring harness: continuity, short circuit (Climate control unit- fuse: J-ROOM 15 A) • ROOM 15 A fuse
K | IG2 | A/C 10 A fuse | IG SW ON | B+ | • Wiring harness: continuity, short circuit (Climate control unit- fuse: K-A/C 10 A) • A/C 10 A fuse
IG SW LOCK | 1.0 or less | • Wiring harness: continuity, short circuit (Climate control unit- fuse: K-A/C 10 A)
L | Potentiometer input | Airflow mode actuator | VENT | 4.5 | • Wiring harness: continuity, short circuit (Climate control unit-airflow mode actuator: L-C) • Airflow mode actuator • Climate control unit: terminal voltage (P)
BILEVEL | 3.7
HEAT | 2.9
HEAT/DEF | 1.9
DEFROSTER | 0.8
M | Motor operation | Air intake actuator | Switched to RECIRCULATE | 1.0 or less | • Wiring harness: continuity, short circuit (Climate control unit-air intake actuator: M-G, O-E, Q-C) • Air intake actuator
Switched to FRESH | 12
N | Potentiometer input | Air mix actuator | Set temperature at MAX COLD | 0.8 | • Wiring harness: continuity, short circuit (Climate control unit-air mix actuator: N-C) • Air mix actuator • Climate control unit: terminal voltage (P)
Set temperature at MAX HOT | 4.5
O | Motor operation | Air intake actuator | Switched to RECIRCULATE | 12 | • Wiring harness: continuity, short circuit (Climate control unit-air intake actuator: M-G, O-E) • Air intake actuator
Switched to FRESH | 1.0 or less
P | +5 V | • Air mix actuator • Airflow mode actuator • Solar radiation sensor | IG SW ON | 5.2 | • Wiring harness: short circuit (Climate control unit-air mix actuator, airflow mode actuator, solar radiation sensor: P-A, B, A) • Air mix actuator • Airflow mode actuator • Solar radiation sensor • Climate control unit: terminal voltage (K, V)
IG SW LOCK | 0 | • Climate control unit replacement
Q | Motor operation | Air intake actuator | Switched to RECIRCULATE | 1.0 or less | • Wiring harness: continuity, short circuit (Climate control unit-air intake actuator: Q-C, M-G) • Air intake actuator
Switched to FRESH | 12
R | Cabin temperature sensor input | Cabin temperature sensor | Compared with temperature detected by cabin temperature sensor | Refer to graph 2 | • Wiring harness: continuity (Climate control unit-cabin temperature sensor: R-D, U-B) • Wiring harness: short circuit (Climate control unit-cabin temperature sensor: R-B) • Cabin temperature sensor • Climate control unit: terminal voltage (K, V)
S | Solar radiation sensor input | Solar radiation sensor | Incandescent light (approx. 60 W) shined directly on the solar radiation sensor from a distance of approx. 100 mm {3.9 in} | 4.0 | • Wiring harness: continuity (Climate control unit-solar radiation sensor: S-B, P-A) • Climate control unit: terminal voltage (P) • Solar radiation sensor
Blocking light to solar radiation sensor | 1.0 or less
T | Evaporator temperature sensor input | Evaporator temperature sensor | Compared with temperature detected by evaporator temperature sensor | Refer to graph 1 | • Wiring harness: continuity (Climate control unit-evaporator temperature sensor: T-B, U-A) • Wiring harness: short circuit (Climate control unit-evaporator temperature sensor: T-B) • Evaporator temperature sensor • Climate control unit: terminal voltage (K, V)
U | Sensor GND | • Cabin temperature sensor • Evaporator temperature sensor • Air mix actuator • Airflow mode actuator | Under any condition | 1.0 or less | • Climate control unit: terminal voltage (V)
V | GND | Body ground | Under any condition | 1.0 or less | • Wiring harness: continuity (Climate control unit-GND: V-GND)
W | Signal | - | - | - | -
X | Signal | - | - | - | -