Defroster Position Signal

DEFROSTER POSITION SIGNAL

Component Function Check


1. CHECK DEFROSTER POSITION SIGNAL

With CONSULT
1.Turn ignition switch ON.
2.Select "AIR CONDITIONER" of "BCM" using CONSULT.
3.Select "FR DEF SW" in "DATA MONITOR" mode, and check status under the following condition.





Is the inspection result normal?
YES- INSPECTION END
NO- .


Diagnosis Procedure


1. CHECK MODE SWITCH POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect A/C control connector.
3.Turn ignition switch ON.
4.Check output waveform between A/C control harness connector and ground with using oscilloscope.





Is the inspection result normal?
YES- GO TO 2.
NO- GO TO 3.

2. CHECK MODE SWITCH GROUND CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Check continuity between A/C control harness connector and ground.





Is the inspection result normal?
YES- Replace A/C control. Removal And Installation.
NO- Repair harness or connector.

3. CHECK MODE SWITCH POWER SUPPLY CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect BCM connector.
3.Check continuity between A/C control harness connector and BCM harness connector.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK MODE SWITCH POWER SUPPLY CIRCUIT FOR SHORT

Check continuity between A/C control harness connector and ground.





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