Rear Window Defogger Relay

REAR WINDOW DEFOGGER RELAY

Description

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


Component Function Check


1. CHECK FUNCTION

1.Turn ignition switch ON.
2.Check that an operation noise of rear window defogger relay can be heard when turning the rear window defogger switch ON.
Is the inspection result normal?
YES- Rear window defogger relay function is OK.
NO-


Diagnosis Procedure

Regarding Wiring Diagram information, [1][2]Electrical Diagrams.

1. CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF and disconnect rear window defogger relay connector.
2.Turn ignition switch ON.
3.Check voltage between rear window defogger relay harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK FUSE

1.Turn ignition switch OFF.
2.Check 10A fuse (No. 5).
Is the inspection result normal?
YES- Check ignition power supply circuit. Ignition Power Supply.
NO- If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

3. CHECK REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect BCM connector.
3.Check continuity between BCM harness connector and rear window defogger relay harness connector.





4.Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace harness.

4. CHECK REAR WINDOW DEFOGGER RELAY

.
Is the inspection result normal?
YES- Replace BCM. Service and Repair.
NO- Replace rear window defogger relay.


Component Inspection






Check continuity between terminal 3 and 5, 6 and 7.