Initial Inspection and Diagnostic Overview

NOTE: The Dual Automatic Temperature Control (DATC) module, Driver Door Module (DDM), Front Electronic Module (FEM), and Rear Electronic Module (REM) must be reconfigured upon replacement. For more information refer to Module Communications Network (Information Bus).

1. Verify the customer concern by operating the system.

Visual Inspection Chart:

2. Visually inspect for obvious signs of mechanical or electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the diagnostic tool does not power up, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTICS test. 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 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
^ NO RESP/NOT EQUIP for DATC module, refer to Heating and Air Conditioning.
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), clear the continuous DTCs and carry out self-test diagnostics for the FEM, REM, DDM, and DATC module.
6. If DTCs related to the DATC module are retrieved, refer to Heating and Air Conditioning.
7. If the DTCs retrieved are related to the concern, go to the FEM Diagnostic Trouble Code (DTC) Index, REM Diagnostic Trouble Code (DTC) Index, or DDM Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
8. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue the diagnostics. Symptom Related Diagnostic Procedures