Rear Window Defogger Relay Circuit Check

Rear Window Defogger Relay Circuit Check

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 IPDM E/R) 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
Refer to "Diagnosis Procedure".

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Rear Window Defogger: Wiring Diagram] Rear Window Defogger.

1. CHECK FUSES

Check if any of the following fuses in the IPDM E/R are blown.






Is the inspection result normal?
YES
GO TO 2
NO
If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.

2. CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

1 Turn ignition switch ON.





2 Check voltage between IPDM E/R harness connector E124 terminal 60 and ground.






Is the inspection result normal?
YES
GO TO 3
NO
Replace IPDM E/R. Refer to [IPDM E/R: Removal and Installation of IPDM E/R] Service and Repair.

3. CHECK INTERMITTENT INCIDENT

Check intermittent incident.

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.

Is the inspection result normal?
YES
Check the following.

- Battery power supply circuit
- IPDM E/R
NO
Repair or replace the malfunctioning parts.