Diagnosis Procedure

REAR WINDOW DEFOGGER SWITCH

WITH AUTO A/C : Diagnosis Procedure


1. CHECK AUTO A/C

Check the operating condition of auto A/C
Does auto A/C operate normally?
YES- GO TO 2.
NO- Perform auto A/C diagnosis. Diagnosis Chart By Symptom.

2. 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 4.
NO- GO TO 3.

3. 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.

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