REAR CLIMATE CONTROL UNIT INSPECTION

BME074061325203

With A/C and Heater

1. Slide out the rear climate control unit with the connectors still connected. (See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

2. Turn the ignition switch to ON position.

3. Measure the voltage at each rear climate control unit terminal and refer to terminal voltage table.

• If there is any malfunction, inspect the parts listed under "Inspection item(s)" and the related wiring harness.
- If the parts and wiring harness under "Inspection item(s)" are found to be normal, replace the rear climate control unit.

Terminal voltage table (Reference)

Terminal

Signal

Connected to

Test condition

Voltage (V)/Continuity

Action

A
VENT, COLD signal
Rear airflow mode and air mix actuator
Airflow mode and temperature SW at VENT, COLD
0
• Inspect for continuity or short circuit (Rear climate control unit-Rear airflow mode and air mix actuator: A-A)
• Inspect rear airflow mode and air mix actuator
Airflow mode and temperature SW at HEAT, HOT
B+
B
-
-
-
-
-
D
HEAT, HOT signal
Rear airflow mode and air mix actuator
Airflow mode and temperature SW at HEAT, HOT
B+
• Inspect for continuity or short circuit (Rear climate control unit-Rear airflow mode and air mix actuator: D-C)
• Inspect rear airflow mode and air mix actuator
Airflow mode and temperature SW at VENT, COLD
0
F
-
-
-
-
-
G
TNS
TNS relay
Headlight SW to TNS or Headlight position
B+
• Inspect TNS relay
• Inspect related harness
Headlight SW to OFF position
0
H
GND
GND
Under any condition: Inspect for continuity to ground
Yes
• Inspect related harness

With A/C and Heater (Two-Dial Type)

1. Slide out the rear climate control unit with the connectors still connected. (See REAR CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.)

2. Turn the ignition switch to ON position.

3. Measure the voltage at each rear climate control unit terminal and refer to terminal voltage table.

• If there is any malfunction, inspect the parts listed under "Inspection item(s)" and the related wiring harness.
- If the parts and wiring harness under "Inspection item(s)" are found to be normal, replace the rear climate control unit.

Terminal voltage table (Reference)

Terminal

Signal

Connected to

Test condition

Voltage (V)/Continuity

Action

A
VENT, COLD signal
Airflow mode and air mix actuator
Airflow mode and temperature SW at VENT, COLD
0
• Inspect for continuity or short circuit (Rear climate control unit-Airflow mode and air mix actuator: A-A)
• Inspect airflow mode and air mix actuator
Airflow mode and temperature SW at 1/2 HOT, or HEAT HOT
B+
B
1/2 HOT signal
Airflow mode and air mix actuator
Airflow mode and temperature SW at 1/2 HOT
0
• Inspect for continuity or short circuit (Rear climate control unit-Airflow mode and air mix actuator: B-B)
• Inspect airflow mode and air mix actuator
Airflow mode and temperature SW at VENT COLD or HEAT HOT
B+
D
HEAT, HOT signal
Airflow mode and air mix actuator
Airflow mode and temperature SW at VENT COLD
B+
• Inspect for continuity or short circuit (Rear climate control unit-Airflow mode and air mix actuator: D-C)
• Inspect airflow mode and air mix actuator
Airflow mode and temperature SW at HEAT, HOT or 1/2 HOT
0
F
-
-
-
-
-
G
TNS
TNS relay
Headlight SW to TNS or Headlight position
B+
• Inspect TNS relay
• Inspect related harness
Headlight SW to OFF position
0
H
GND
GND
Under any condition: Inspect for continuity to ground
Yes
• Inspect related harness

With A/C Only or Heater Only

1. Connect the battery positive voltage to terminal B and ground to terminal A.

2. Verify that the bulb illuminates.

• If not as specified, replace the bulb.