Automatic Air Conditioning

BLOWER FAN ON SIGNAL

Component Function Check


1. CHECK BLOWER FAN ON SIGNAL

With CONSULT
1.Turn the ignition switch ON.
2.Select the "FAN REQ SIG" in "DATA MONITOR"
3.Check the fan ON signal when the fan control switch is operated.





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


Diagnosis Procedure


1. CHECK BLOWER FAN ON SIGNAL

1.Turn the ignition switch ON.
2.Check output waveform between A/C auto amp. and ground with using the oscilloscope.





Is inspection result normal?
YES- GO TO 2.
NO- Replace the A/C auto amp.

2. CHECK CONTINUITY BETWEEN A/C AUTO AMP. AND BCM

1.Turn the ignition switch OFF.
2.Disconnect the A/C auto amp. connector.
3.Disconnect the BCM connector.
4.Check continuity A/C auto amp. harness connector and BCM harness connector.





Is inspection result normal?
YES- GO TO 3.
NO- Repair the harnesses or connectors.

3. CHECK CONTINUITY BETWEEN A/C AUTO AMP. AND GROUND

Check continuity between A/C auto amp. harness connector and ground.





Is inspection result normal?
YES- Replace the BCM. Exploded View (WITH I-KEY) or "Exploded View" (WITHOUT I-KEY).
NO- Repair the harnesses or connectors.