Door Motor Communication Circuit
DOOR MOTOR COMMUNICATION CIRCUIT
Diagnosis Procedure
Regarding Wiring Diagram information, refer to "Wiring Diagram" Automatic Air Conditioning.
NOTE:
If all door motor DTCs are detected, check this circuit.
1. CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL
1.Turn ignition switch ON.
2.Check output waveform between A/C auto amp. harness connector and ground with the oscilloscope.
Is the inspection result normal?
YES- GO TO 2.
NO- GO TO 3.
2. CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR OPEN
1.Turn ignition switch OFF.
2.Disconnect A/C auto amp. connector and intake door motor connector.
3.Check continuity between A/C auto amp. harness connector and intake door motor harness connector.
Is the inspection result normal?
YES- Inspection End.
NO- Repair harness or connector.
3. CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR SHORT
1.Disconnect following connectors.
-Air mix door motor LH
-Air mix door motor RH
-Mode door motor
2.Check continuity between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES- Replace A/C auto amp. Refer to "Removal and Installation" Removal And Installation.
NO- Repair harness or connector.