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
^ Battery Junction Box (BJB) Fuse 101 (60A)
^ Central Junction Box (CJB) Fuse 226 (10A)
^ Bulb(s)
^ Central Junction Box (CJB)
^ Generic Electronic Module (GEM)
^ Connectors
^ Circuitry

3. If the concern remains after the inspection, connect the scan tool to the Data Link Connector 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 DIAGNOSTICS test. If the scan tool responds with:
^ CKT914, CKT915 or CKT70 ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus).
^ NO RESPONSE/NOT EQUIPPED for Generic Electronic Module (GEM), refer to Multifunction Electronic Control Module.
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the GEM.
6. If the DTCs retrieved are related to the concern, go to the GEM DTC Index. Diagnostic Trouble Code Tests and Associated Procedures
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart. Symptom Related Diagnostic Procedures