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 (E3) PANEL LAMPS DIMMER SWITCH MUX CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Dimmer Switch harness connector.
3. Turn the ignition on.
4. Turn the Ambient Lamps on.
5. Measure the voltage between ground and the (E3) Panel Lamps Dimmer Switch MUX circuit at the Dimmer Switch harness connector.
  Is the voltage greater than 4.687 volts?
  
  Yes
  - Repair the short to voltage in (E3) Panel Lamps Dimmer Switch MUX circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (E3) PANEL LAMPS DIMMER SWITCH MUX CIRCUIT FOR AN OPEN
1. Turn the Ambient Lamps off.
2. Turn the ignition off.
3. Disconnect the BCM C7/G harness connector.
4. Measure the resistance of the (E3) Panel Lamps Dimmer Switch MUX circuit between the Dimmer Switch harness connector and the BCM C7/G harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the open in the (E3) Panel Lamps Dimmer Switch MUX circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE OPERATION OF THE PANEL LAMPS DIMMER SWITCH
1. Reconnect the BCM C7/G harness connector.
2. Connect a jumper wire between ground and the (E3) Panel Lamps Dimmer Switch MUX circuit at the Dimmer Switch harness connector.
3. Turn the ignition on.
4. With the scan tool, read DTCs.
  Does the scan tool display DTC: B17FF-11-AMBIENT CABIN LIGHT DIMMER SWITCH - CIRCUIT SHORT TO GROUND as active?
  
  Yes
  - Replace the Dimmer Switch in accordance with the Service Information. Refer to DIMMER SWITCH REMOVAL .
  - 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 .