Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. Turn the Ambient Lamps on.
3. With the scan tool, read the Body Control Module (BCM) DTCs and record on the repair order.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE OPERATION OF DIMMER SWITCH
1. Turn the Ambient Lamps off.
2. Turn the ignition off.
3. Disconnect the Dimmer Switch harness connector.
4. Turn the ignition on.
5. Turn the Ambient Lamps on.
6. With the scan tool, read the BCM DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Replace the Dimmer Switch in accordance with the Service Information. Refer to SWITCH, HEADLAMP, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (E3) PANEL LAMPS DIMMER SWITCH MUX CIRCUIT FOR A SHORT TO GROUND
1. Turn the Ambient Lamps off.
2. Turn the ignition off.
3. Disconnect the BCM C7/G harness connector.
4. Check for continuity between ground and the (E3) Panel Lamps Dimmer Switch MUX circuit at the Dimmer Switch harness connector.
  Is there continuity between ground and the (E3) Panel Lamps Dimmer Switch MUX circuit?
  
  Yes
  - Repair the short to ground in the (E3) Panel Lamps Dimmer Switch MUX circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .