Rear Window Defogger Switch Circuit Inspection

REAR WINDOW DEFOGGER

Rear Window Defogger Switch Circuit Inspection


1. CHECK REAR WINDOW DEFOGGER SWITCH OPERATION

With CONSULT
Check ("REAR DEF SW", "IGN ON SW") in DATA MONITOR mode with CONSULT.
When rear window defogger switch is turned to ON
REAR DEF SW: ON

When ignition switch is turned to ON
IGN ON SW: ON





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. Removal And Installation.

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. 5V
OK or NG
OK- Replace front air control.
NG- Replace BCM. Service and Repair.