Diagnosis Procedure

BLOWER FAN ON SIGNAL


Diagnosis Procedure

1.CHECK BLOWER FAN ON SIGNAL OUTPUT
1. Turn the ignition switch OFF.
2. Disconnect the fan switch connector.
3. Turn the ignition switch ON.
4. Check output waveform between fan switch harness connector and the ground with using oscilloscope.





Is inspection result normal?
YES - Replace the fan switch (A/C control).
NO - GO TO 2.
2.CHECK CONTINUITY BETWEEN FAN SWITCH AND BCM
1. Turn the ignition switch OFF.
2. Disconnect the BCM connector.
3. Check continuity between fan switch harness connector and BCM harness connector.





Is inspection result normal?
YES - GO TO 3.
NO - Repair the harness or connector.
3.CHECK CONTINUITY BETWEEN FAN SWITCH AND GROUND
Check continuity between fan switch harness connector and the ground.





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