Conventional Instrument Cluster

1. Verify the customer's concern by operating the instrument cluster to duplicate the condition and by observing the indicators and gauges to determine if they are operating properly with the ignition switch:
- in RUN with the engine OFF.
- in START before the ignition switch is released.
- in RUN with the engine running.
2. Inspect to determine if any of the mechanical or electrical concerns apply:

VISUAL INSPECTION CHART

Mechanical
- Damaged fuel tank
- Engine coolant level
- Engine oil level
- Accessory drive belt

Electrical
- Fuse 13 (15 A)
- Circuit wiring
- Damaged switches or sensors

3. If the inspection reveals obvious concern(s) that can be readily identified, service as required.
4. If a concern remains after the inspection, use Rotunda New Generation Star (NGS) Tester 418-F048 (007-00500) or equivalent connected to the Data Link Connector (DLC) to retrieve continuous Diagnostic Trouble Codes (DTCs) and to execute Self Test Diagnostics for the Lighting Control Module. If, after performing data link diagnostic test, the New Generation Star (NGS) Tester responds with NO RESPONSE/NOT EQUIPPED, go to Pinpoint Test A.

A: No Communication With Lighting Control Module

5. If self test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics.

Conventional Instrument Cluster

6. If DTCs are retrieved, go to the Lighting Control Module (LCM) Diagnostic Trouble Codes (DTCs) Index to continue diagnostics.

Lighting Control Module (LCM) Diagnostic Trouble Code (DTC) Index

7. If the lighting control module cannot be accessed by the New Generation Star (NGS) Tester, go to Pinpoint Test A.

A: No Communication With Lighting Control Module

The Rotunda Service Bay Diagnostic System (SBDS (R)) may also be used to diagnose this system.