Rear Window Defogger Switch

REAR WINDOW DEFOGGER SWITCH

Description

- The rear window defogger is operated by turning the rear window defogger switch ON.
- Turns the indicator lamp in the rear window defogger switch ON when operating the rear window defogger.


Component Function Check


1. CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

Check that the indicator lamp of rear window defogger illuminates with rear window defogger switch ON.
Is the inspection result normal?
YES- Rear window defogger switch function is OK.
NO- .


Diagnosis Procedure

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

1. CHECK A/C AUTO AMP. (REAR WINDOW DEFOGGER SWITCH)

Check A/C auto amp. operation.
Is the inspection result normal?
YES- Inspection End.
NO- GO TO 2

2. CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL

1.Turn ignition switch ON.
2.Check voltage between A/C auto amp. harness connector M37 terminal 27 and ground.





Is the inspection result normal?
YES- GO TO 3
NO- GO TO 4

3. CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect A/C auto amp harness connector M37.
3.Disconnect BCM harness connector M18.
4.Check continuity between A/C auto amp harness connector M37 terminal 27 and BCM harness connector
M18 terminal 38.





Is the inspection result normal?
YES- Replace BCM. Service and Repair.
NO- Repair and replace harness.

4. CHECK REAR WINDOW DEFOGGER SWITCH REQUIRE SIGNAL CIRCUIT FOR SHORT

1.Turn ignition switch OFF.
2.Disconnect BCM harness connector M18.
3.Disconnect A/C auto amp harness connector M37.
4.Check continuity between BCM harness connector M18 terminal 38 and ground.





Is the inspection result normal?
YES- Replace A/C auto amp. With Monochrome Display.
NO- Repair or replace harness.