Diagnosis Procedure

REAR WINDOW DEFOGGER RELAY


Description

Power is supplied to the rear window defogger with BCM control.




REAR WINDOW DEFOGGER RELAY


Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.
1. CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT
1. Turn ignition switch ON.





2. Check voltage between BCM harness connector M18 terminal
59 and ground.





Is the inspection result normal?
YES - Rear window defogger relay power supply circuit is OK.
NO - GO TO 2
2. CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and fuse block (J/B).





3. Check continuity between BCM harness connector M18 (A) terminal 59 and fuse block (J/B) harness connector M4 (B) terminal 4Q.





4. Check continuity between BCM harness connector M18 (A) terminal 59 and ground.





Is the inspection result normal?
YES - GO TO 3
NO - Repair or replace harness.
3. CHECK REAR WINDOW DEFOGGER RELAY
Check rear window defogger relay. Component Inspection.
Is the inspection result normal?
YES - GO TO 4
NO - Replace rear window defogger relay.
4. CHECK INTERMITTENT INCIDENT
Check intermittent incident. Intermittent Incident.
Is the inspection result normal?
YES - Check the following.
- Battery power supply circuit.
- Fuse block (J/B).
NO - Repair or replace the malfunctioning parts.