Inspection and Verification

INSPECTION AND VERIFICATION

NOTE:
- The message center is also referred to as the overhead trip computer (OTC).
- The OTC must be reconfigured upon installation of a new message center. Refer to the diagnostic tool help screen on the configuration card to program the fuel tank size.

1. Verify the customer concern.

Visual Inspection Chart:

2. Visually inspect for obvious signs of mechanical or electrical damage.
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. NOTE: Before carrying out the self-test diagnostics, the headlamp switch must be turned to the headlamps ON position and the vehicle must be running.

Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- ISO circuit fault; all electronic control units no response/not equipped, refer to Information Bus (Module Communications Network).
- No response/not equipped for the OTC, GO to Pinpoint Test B. Test B: No Communication With the Message Center
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the OTC.

6. If the DTCs retrieved are related to the concern, go to the Overhead Trip Computer (OTC) Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
7. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures