Heated Glass Element Relay: Testing and Inspection

REAR WINDOW DEFOGGER RELAY

Description

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


Component Function Check


1. CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] can be heard when turning the rear window defogger switch ON.
Is the inspection result normal?
YES- Rear window defogger relay power supply circuit is OK.
NO- .


Diagnosis Procedure

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


Component Inspection


1. CHECK REAR WINDOW DEFOGGER RELAY






Check rear window defogger relay.





Is the inspection result normal?
YES- Inspection End.
NO- Replace rear window defogger relay.