Rear Window Defogger Switch Circuit Inspection

REAR WINDOW DEFOGGER


Rear Window Defogger Switch Circuit Inspection

1.CHECK REAR WINDOW DEFOGGER SWITCH OPERATION

With CONSULT-III
Check ("REAR DEF SW", "IGN ON SW") in DATA MONITOR mode with CONSULT-III.






Without CONSULT-III
1. Turn ignition switch ON.





2. Check voltage between BCM connector and ground.





OK or NG
OK >> Rear window defogger switch check is OK.
NG >> GO TO 2.
2.CHECK REAR WINDOW DEFOGGER SWITCH CIRCUIT HARNESS CONTINUITY





1. Turn ignition switch OFF.
2. Disconnect BCM and front air control.
3. Check continuity between BCM connector M18 (A) terminal 9 and front air control connector M33 (B) terminal 3.

9 - 3 : Continuity should exist.

4. Check continuity between BCM connector M18 (A) terminal 9 and ground

9 - Ground : Continuity should not exist.

OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3.CHECK REAR WINDOW DEFOGGER SWITCH





Check continuity between front air control terminals.





OK or NG
OK >> GO TO 4.
NG >> Replace front air control. Refer to Removal and Replacement,
4.CHECK REAR WINDOW DEFOGGER SWITCH GROUND





Check continuity between front air control connector M33 terminal 8 and ground.





OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness.
5.CHECK BCM OUTPUT SIGNAL





1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M18 terminal 9 and ground.

9 - Ground : Approx. 5 V

OK or NG
OK >> Replace front air control. Refer to Removal and Replacement .
NG >> Replace BCM. Refer to Service and Repair .