Manual Air Conditioning

BLOWER FAN ON SIGNAL

Component Function Check


1. CHECK BLOWER FAN ON SIGNAL

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





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


Diagnosis Procedure


1. CHECK FAN SWITCH POWER SUPPLY SIGNAL

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





Is the inspection result normal?
YES- Replace A/C control. Removal And Installation.
NO- GO TO 2.

2. CHECK BLOWER FAN ON SIGNAL CIRCUIT FOR OPEN

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





Is the inspection result normal?
YES- GO TO 3.
NO- Repair harness or connector.

3. CHECK BLOWER FAN ON SIGNAL 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.