Initial Inspection and Diagnostic Overview

NOTE: Before starting electrical diagnosis, check for mechanical binds by manually operating the door locks. Operate lock system several times from each switch while observing the operation of all door locks. Be sure battery is fully charged.

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







VISUAL INSPECTION CHART

3. If the concern remains after the inspection, connect 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 scan tool does not communicate with the vehicle:
1 Check that the program card is correctly installed.
2 Check the connections to the vehicle.
3 Check the ignition switch position.

4. If scan tool still does not communicate with the vehicle, refer to the scan tool manual.
5. Carry out the DATA LINK DIAGNOSTICS test. If scan tool responds with:
1 CKT914, CKT915 or CKT7O = ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus).
2 NO RESP/NOT EQUIP for the DDM, go to Pinpoint Test A. Test A: No Communication With the Driver Door Module
3 NO RESP/NOT EQUIP for the LCM, go to Pinpoint Test B. Test B: No Communication With the Lighting Control Module
4 SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the DDM and LCM.

6. If the DTCs retrieved are related to the concern, go to the DDM Diagnostic Trouble Code (DTC) Index or LCM Diagnostic Trouble Code (DTC) Index to continue diagnostics. LCM 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