Automatic 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.
4.Check blower fan ON signal when the fan control dial is operated.





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


Diagnosis Procedure


1. CHECK BLOWER FAN ON SIGNAL

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





Is the inspection result normal?
YES- Replace A/C auto amp. 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 auto amp. 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 auto amp. harness connector and ground.





Is the inspection result normal?
YES- Replace BCM. With Intelligent Key System.
NO- Repair harness or connector.