Inspection and Verification

Vehicle Dynamic Suspension

Inspection and Verification

NOTE: Before diagnosing the air suspension system, carry out the VDM self-test. If a DTC is present, follow the diagnosis and testing procedures. If no DTC is present, check the vehicle ride height by following the ride height adjustment procedure.

If the system cannot reach the correct ride height, check all of the air tubes and connections for leaks, blockage or damage, height sensor integrity and/or compressor relay operation before installing a new air compressor.

1. Verify the customer concern.

2. NOTE: If the door ajar indicator is illuminated, repair the door ajar indicator. Refer to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.

Visually inspect for obvious signs of mechanical and 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 VDM LED prove out confirms power and ground from the DLC are provided to the VCM.

If the scan tool does not communicate with the VDM:

- check the VDM connection to the vehicle.

- check the scan tool connection to the VDM.

- refer to Module Communications Network Testing and Inspection, 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.

- refer to Module Communications Network Testing and Inspection to diagnose no response from the PCM.

7. Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to Module Communications Network Testing and Inspection.

- If the network test passes, retrieve and record continuous memory DTCs.

8. Clear the continuous DTCs and carry out the self-test diagnostics for the VDM.

9. If the DTCs retrieved are related to the concern, go to Vehicle Dynamics Module (VDM) DTC Chart Diagnostic Trouble Code Tests and Associated Procedures. For all other DTCs, refer to Multifunction Electronic Modules Testing and Inspection.

10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. Symptom Related Diagnostic Procedures