DTC B1274, B1275

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DTC B1274, B1275

B3E070201038W06

DTC B1274, B1275 | Airflow mode actuator (potentiometer) system
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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
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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.)