Operation CHARM: Car repair manuals for everyone.
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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.
- The Lighting Control Module (LCM) must be reconfigured upon replacement. Refer to Module Communications Network (Information Bus).

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 the diagnostic tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic 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 diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTICS test. Pinpoint Test PC (Precheck)
If the diagnostic tool responds with:
- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus).
- NO RESP/NOT EQUIP for DDM, go to Pinpoint Test B. Test B: Smart Lock Does Not Operate Correctly
- NO RESP/NOT EQUIP for LCM, go to Pinpoint Test A. Test A: A Single Door Lock Is Inoperative - Decklid Does Not Operate Correctly
- SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the DDM or LCM.
6. If the DTCs retrieved are related to the concern, go to DDM Diagnostic Trouble Code (DTC) Index or LCM Diagnostic Trouble Code (DTC) Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures
7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures