Inspection and Verification

Interior Lighting

Inspection and Verification

1. Verify the customer concern.

2. Visually inspect for obvious signs of electrical damage.

Visual Inspection Chart






3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).


5. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC (Data Link Connector) are provided to the VCM (Vehicle Communication Module).
If the scan tool does not communicate with the VCM (Vehicle Communication Module) :

- Check the VCM (Vehicle Communication Module) connection to the vehicle.

- Check the scan tool connection to the VCM (Vehicle Communication Module).

- Refer to - No Power To The Scan Tool, to diagnose no power to the scan tool.


6. If the scan tool does not communicate with the vehicle:
- Verify the ignition is ON.
- The air bag warning indicator prove-out confirms ignition ON (other indicators may not prove ignition is ON). If ignition does not turn ON, refer to Steering Column to diagnose No Power in Run.

- Verify the scan tool operation with a known good vehicle.

- to diagnose no response from the PCM.


7. Carry out the network test.
- If the scan tool responds with no communication with one or more modules, refer to Information Bus.

- If the network test passes, retrieve and record the continuous memory DTCs.


8. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB (Smart Junction Box), the Interior Lighting Control Module (ILCM) (if equipped) and the Remote Function Actuator (RFA) module (if equipped).

9. If the DTCs retrieved are related to the concern, go to DTC Charts. Lighting and Horns For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Body Control Module / Body Control Systems Body Control Module / Body Control Systems

10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures