Initial Inspection and Diagnostic Overview

INSPECTION AND VERIFICATION

1. Verify the customer concern.

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. If the cause is not visually evident, 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. NOTE: The audio unit must be in AM, FM1 or FM2 mode to enter diagnostic tool tester diagnostics.

If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.

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

6. If the DTCs retrieved are related to the concern, go to the Audio Unit Diagnostic Trouble Code (DTC) Index. Diagnostic Trouble Code Tests and Associated Procedures
7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart. Symptom Related Diagnostic Procedures
8. If the fault is visually evident, proceed to the Symptom Chart. Symptom Related Diagnostic Procedures
9. If the fault is not visually evident, proceed to speaker walk-around test, audio unit self-diagnostic mode and the diagnostic tool. Speaker Walk-Around Test Audio Unit Self-Diagnostic Mode