Initial Inspection and Diagnostic Overview

NAVIGATION SYSTEM

Inspection and Verification

1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart





3. If the fault is visually evident, correct the cause (if possible) before proceeding to the next step.

NOTE:Make sure to use the latest scan tool software release.
4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

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

- See Pinpoint Test 17: No Power To The Scan Tool, to diagnose no power to 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.

- See Pinpoint Test 1: The PCM Does Not Respond To The Scan Tool, to diagnose no response from the PCM.

7. Carry out the network test.

- If the scan tool responds with no communication from one or more modules, see - Communications Network - Troubleshooting.
- 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.

NOTE:Do not press any buttons on the ACM while it is carrying out the self-test.
9. If the DTCs retrieved are related to the concern, see Navigation System - DTC Chart.

10. If no DTCs related to the concern are retrieved, see - Symptom Troubleshooting Chart - Navigation.