Rear Window Defogger Switch Circuit Check
Rear Window Defogger Switch Circuit Check
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
Refer to "Diagnosis Procedure Front Air Control".
Diagnosis Procedure Front Air Control
Regarding Wiring Diagram information, refer to [Rear Window Defogger: Wiring Diagram] Rear Window Defogger.
1. CHECK REAR WINDOW DEFOGGER SWITCH REQUEST SIGNAL
1 Turn ignition switch ON.
2 Check voltage between front air control harness connector and ground.
Is the inspection result normal?
YES
GO TO 4
NO
GO TO 2
2. CHECK REAR WINDOW DEFOGGER SWITCH VOLTAGE SIGNAL
1 Turn ignition switch OFF.
2 Disconnect front air control.
3 Turn ignition switch ON.
4 Check voltage between front air control harness connector and ground.
Is the inspection result normal?
YES
Replace front air control. Refer to [Control Unit: Removal and Installation] Service and Repair.
NO
GO TO 3
3. CHECK HARNESS CONTINUITY
1 Turn ignition switch OFF.
2 Disconnect BCM harness connector M18.
3 Check continuity between BCM harness connector M18 terminal 9 and front air control harness connector.
4 Check continuity between BCM harness connector M18 terminal 9 and ground.
Is the inspection result normal?
YES
Replace BCM. Refer to [BCM: Removal and Installation] Removal and Replacement.
NO
Repair or replace harness as necessary.
4. CHECK REAR WINDOW DEFOGGER SWITCH INDICATOR CIRCUIT
Check voltage between front air control harness connector and ground.
Is the inspection result normal?
YES
Replace front air control. Refer to [Control Unit: Removal and Installation] Service and Repair.
NO
Repair or replace harness as necessary.