Rear Booster Fan Rear Control Switch Back Lighting Inoperative (ATC)

*REAR BOOSTER FAN REAR CONTROL SWITCH BACK LIGHTING INOPERATIVE (ATC)

For a complete wiring diagram Consult Diagrams/Electrical





Diagnostic Test

1. CHECK FOR INSTRUMENT CLUSTER DTCs
Turn the ignition on.
With the scan tool, read Instrument Cluster DTCs.
Does scan tool display any DTCs?

Yes

- Diagnose and Repair the DTC(s).

No

- Go To 2

2. CHECK FOR BCM DTCs
With the scan tool, read BCM DTCs.
Does scan tool display any DTCs?

Yes

- Diagnose and Repair the DTC(s).

No

- Go To 3

3. CHECK (E12) PANEL LAMPS DRIVER CIRCUIT FUNCTION
Turn the ignition off.
Rotate the Panel Lamps Dimmer Switch to the off position.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Turn the park lamps on.
Measure the voltage of the (E12) Panel Lamps Driver circuit while rotating the Panel Lamps Dimmer Switch from the off position to the full brightness position.
Does the voltage change from approximately 4.5 volts to 11.5 volts?

Yes

- Replace the Rear Booster Fan Rear Control Switch.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To 4

4. CHECK (E12) PANEL LAMPS DRIVER CIRCUIT FOR AN OPEN
Disconnect the Instrument Cluster C1 harness connector.
Measure the resistance of the (E12) Panel Lamps Driver circuit between the Rear Booster Fan Rear Control Switch harness connector and the Instrument Cluster C1 harness connector.
Does the ohm meter read open circuit?

Yes

- Repair the (E12) Panel Lamps Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Replace the Instrument Cluster.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.