Inspection and Verification
WARNING:
If equipped with fire suppression system, refer to FIRE SUPPRESSION SYSTEM
article for important safety warnings.
- Verify the customer concern.
- Visually inspect the following for obvious signs of mechanical or electrical damage.VISUAL INSPECTION CHART
Mechanical Electrical - Instrument panel dimmer switch
- Central junction box (CJB) fuses:
- 4 (10A)
- 9 (7.5A)
- Bulbs
- Circuitry
- Lighting control module (LCM)
- Driver Door Module (DDM)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
- If the scan tool does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM.
- Refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
- If the scan tool does not communicate with the vehicle:
- Verify the ignition key is in the ON position.
- Verify the scan tool operation with a known good vehicle.
- Refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the powertrain control module (PCM).
- Carry out the network test:
- If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
- If the network test passes, retrieve and record the continuous memory DTCs.
- Clear the continuous DTCs and carry out the self-test diagnostics for the LCM.
- If the DTCs retrieved are related to the concern, go to the Lighting Control Module (LCM) Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
- If no DTCs related to the concern are retrieved, go to Symptom Chart .
NOTE:
Make sure to use the latest scan tool software release.
NOTE:
The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
LIGHTING CONTROL MODULE (LCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX
| DTC | Description | Action |
|---|---|---|
| B1342 | ECU is Defective | CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new LCM. REFER to MULTIFUNCTION ELECTRONIC MODULES article. |
| B2212 | Instrument Panel Dimmer Switch Out of Range | Go to Pinpoint Test G . |
| All other DTCs | - | REFER to MULTIFUNCTION ELECTRONIC MODULES article. |