Diagnosis Procedure

AIR MIX DOOR MOTOR


WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Diagnosis Procedure

1.PERFORM SELF-DIAGNOSIS STEP-2
Perform self-diagnosis STEP-2.
Does code No. 20 appear on the display.
YES - GO TO 2.
NO - Go to appropriate malfunctioning sensor circuit. Refer to Diagnosis Description
2.PERFORM SELF-DIAGNOSIS STEP-4
Perform self-diagnosis STEP-4.
Is it operated normally?
YES - END.
NO - GO TO 3.
3.CHECK INSTALLATION OF AIR MIX DOOR MOTOR
Check installation of air mix door motor. Refer to Exploded View.
Is it installed normally?
YES - GO TO 4.
NO - Repair or replace air mix door motor.
4.CHECK POWER SUPPLY FOR AIR MIX DOOR MOTOR
Check voltage between air mix door motor harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair harness or connector.
5.CHECK SIGNAL FOR AIR MIX DOOR MOTOR
Confirm A/C LAN signal between air mix door motor harness connector and ground using an oscilloscope.





Is the inspection result normal?
YES - GO TO 6.
NO - Repair harness or connector.
6.CHECK AIR MIX DOOR MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air mix door motor connector.
3. Check continuity between air mix door motor harness connector and ground.





Is the inspection result normal?
YES - Replace air mix door motor.
NO - Repair harness or connector.