Inspection and Verification

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart:

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. NOTE: Make sure to use the latest scan tool software release.

If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

5. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VCM:
- Check the VCM connection to the vehicle.
- Check the scan tool connection to the VCM.
- Refer to Information Bus (Module Communications Network), No Power To The Scan Tool, to diagnose no communication with the scan tool.

6. If the scan tool does not communicate with the vehicle:
- Verify the ignition key is in the ON position.
- Verify the scan tool operation with a known good vehicle.
- Refer to Information Bus (Module Communications Network) to diagnose no response from the PCM.

7. NOTE: Do not press any buttons on the ACM while the ACM is carrying out the self-test.

Carry out the network test.

- If the scan tool responds with no communication for one or more modules, refer to Information Bus (Module Communications Network).
- If the network test passes, retrieve and record the continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics for the ACM.
9. If the DTCs retrieved are related to the concern, go to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions
10. If no DTCs related to the concern are retrieved, go to the Speaker Walk-Around Test (All Audio Systems Except Navigation), the ACM Self-Diagnostic Mode (All Audio Systems Except Navigation), the Navigation System Self-Diagnostic Mode (Navigation Only), or the Satellite Audio Bezel Diagnostic Test. Component Tests and General Diagnostics ACM Self-Diagnostic Mode (All Audio Systems Except Navigation) Navigation System Self-Diagnostic Mode (Navigation Only) Satellite Audio Bezel Diagnostic Test