Initial Inspection and Diagnostic Overview

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Electrical
^ Wiring harness
^ Loose or corroded connections
^ Battery junction box Fuses:
- 404 (10A)
- 405 (10A)
- 422 (20A)
- 425 (40A)
- 423 (30A)
- 424 (30A)
- 430 (30A)
- 431 (30A)

^ Central junction box Fuses:
- 207 (5A)
- 220 (10A)
- 222 (10A)
- 235 (5A)

^ Lamp(s)
^ Relay(s)
^ Headlamp switch
^ Instrument cluster
^ Dimmer switch
^ FEM
^ REM
^ DDM

3. If the concern remains alter 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 DIAGNOSTICS test. If the NGS Tester responds with:
^ CKT914, CKT915 or CKT7O ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus).
^ NO RESP/NOT EQUIP for FEM, go to Pinpoint Test A. Test A: No Communication With The Front Electronic Module
^ NO RESP/NOT EQUIP for REM, go to Pinpoint Test B. Test B: No Communication With The Rear Electronic Module
^ NO RESP/NOT EQUIP for DDM, go to Pinpoint Test C. Test C: No Communication With the Driver Door Module
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the FEM.

6. If the DTCs retrieved are related to the concern,
go to FEM DTC Index FEM Diagnostic Trouble Code (DTC) Index
or REM DTC Index. REM Diagnostic Trouble Code (DTC) Index
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures