Diagnosis Procedure

REAR WINDOW DEFOGGER SWITCH


WITH AUTO A/C : Description

- The rear window defogger is operated by turning the rear window defogger switch ON.
- The indicator lamp in the rear window defogger illuminates when the rear window defogger is operating.





REAR WINDOW DEFOGGER SWITCH


WITH AUTO A/C : Diagnosis Procedure

1.CHECK BCM OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check signal between A/C auto amp. harness connector and ground using oscilloscope.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK REAR WINDOW DEFOGGER SWITCH CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector and A/C auto amp. harness connector.





3. Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES - Replace BCM. Removal And Installation.
NO - Repair or replace harness.
3.CHECK GROUND CIRCUIT
Check continuity between A/C auto amp. harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace harness.
4.CHECK REAR WINDOW DEFOGGER SWITCH
Component Inspection.
Is the inspection result normal?
YES - GO TO 5.
NO - Replace A/C auto amp. Removal And Installation.
5.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
- INSPECTION END