Initial Inspection and Diagnostic Overview

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







VISUAL INSPECTION CHART

3. If the concern remains after the inspection, connect the scan tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool 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 scan tool still does not communicate with the vehicle, refer to the scan tool manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the scan tool responds with:
^ CKT914, CKT915 or CKT7O =ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus).
^ NO RESP/NOT EQUIP for REM, go to Pinpoint Test B. Test B: No Communication With the Rear Electronic Module
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the REM.
6. If the DTCs retrieved are related to the concern, go to REM Diagnostic Trouble Code (DTC) Index or SSP Relay Index to continue diagnostics. Refer to Headlamps. 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