Initial Inspection and Diagnostic Overview

1. Verify the customer concern by operating the interior lamps by opening a door.
2. Visually inspect for obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Mechanical
^ REM
^ FEM
^ Instrument cluster

Electrical
^ Central junction box:
- Fuse 16 (10 A)
- Fuse 9 (10 A)
- Fuse 8 (20 A)
- Fuse 28 (10 A)
- Fuse 14 (10 A)
- Fuse 1 (10 A)

^ Battery junction box:
- Fuse 2 (10 A)
- Fuse 23 (15 A)
- Fuse 103 (40 A)
- Fuse 108 (40 A)
- Fuse 109 (40 A)
- Fuse 114 (40 A)

^ Lamp(s)
^ Relay(s)
^ Headlamp switch
^ Instrument cluster
^ Dimmer switch
^ REM
^ FEM
^ Wiring harness
^ Loose or corroded connections

3. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the data link connector located beneath the instrument panel and select the vehicle to be tested from the NGS Tester menu. If the NGS Tester does not communicate with the vehicle:
^ Check that the program card is correctly installed.
^ Check the connections to the vehicle.
^ Check the ignition switch position.

4. If the NGS Tester still does not communicate with the vehicle, refer to the NGS Tester manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the NGS Tester responds with:
^ CKT 914, CKT 915 or CKT 7O-ALLECUS NO RESP/NOT EQUIP, refer to Information Bus.
^ NO RESP/NOT EQUIP for FEM, go to Pinpoint Test A. A No Communication With the Front Electronic Module
^ NO RESP/NOT EQUIP for REM, go to Pinpoint Test B. B No Communication With the Rear Electronic Module
^ NO RESP/NOT EQUIP for Instrument Cluster, go to Pinpoint Test C. C No Communication With the Instrument Cluster
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the FEM, REM, and Instrument Cluster.
6. If the DTCs retrieved are related to the concern, go to FEM DTC Index FEM Diagnostic Trouble Code Index,
REM DTC Index REM Diagnostic Trouble Code Index,
Instrument Cluster DTC Index ICM Diagnostic Trouble Code Index,
or SSP Relay Index to continue diagnostics. Component Tests and General Diagnostics
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures