DTC B1274, B1275


id070200800800

DTC B1274, B1275

Airflow mode actuator (potentiometer) system

POSSIBLE CAUSE

• Airflow mode actuator malfunction
• Open circuit in wiring harness between climate control unit and airflow mode actuator
• Short circuit in wiring harness between climate control unit (terminal L) and air mix actuator (terminal C)

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
• Inspect the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSPECTION.)
• Is it normal?
Yes
Go to the next step.
No
Replace the airflow mode actuator. (See AIRFLOW MODE ACTUATOR REMOVAL/INSTALLATION.)
2
• Disconnect the climate control unit connector and the airflow mode actuator connector.
• Is there an open circuit in the wiring harness between the following terminals of the climate control unit and the airflow mode actuator?
- P-B
- L-C
- U-A
Yes
Repair the wiring harness.
No
Go to the next step.
3
• Is there a short circuit to ground in the wiring harness between climate control unit terminal L and airflow mode actuator terminal C?
Yes
Repair the wiring harness.
No
The system is normal at present. (Clear the past malfunction from the memory.)