Diagnosis Procedure

A/C SWITCH


Description

- Each signal is sent to BCM by pressing the A/C switch.
- BCM judges the recognition that A/C switch is ON or OFF according to input switch signal.





A/C SWITCH


Diagnosis Procedure

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





Is inspection result normal?
YES - GO TO 2.
NO - GO TO 3.
2.CHECK CONTINUITY A/C CONTROL GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between A/C control harness connector and the ground.





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





Is inspection result normal?
YES - GO TO 4.
NO - Repair the harness or connector.
4.CHECK CONTINUITY BETWEEN A/C CONTROL AND GROUND
Check continuity between A/C control harness connector and the ground.





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