Initial Inspection and Diagnostic Overview

INSPECTION AND VERIFICATION

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:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch is in RUN position.
- If the diagnostic tool still does not power up, refer to the diagnostic tool manual.

5. Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with:
- SCP+, SCP-, or UBP circuits fault = ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus).
- NO RESP/NOT EQUIP for GEM, refer to Antitheft and Alarm Systems.
- 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 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, GO to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
8. If DTCs are not present in GEM Diagnostic Trouble Code (DTC) Index, refer to the master DTC index in Antitheft and Alarm Systems. Diagnostic Trouble Code Tests and Associated Procedures