4-Wheel Vehicle Dynamic Suspension

Inspection and Verification
1. Verify the customer concern.

2. Note: If the door ajar indicator is illuminated when all doors, liftgate, and liftgate glass are closed, the air suspension will not work correctly. Repair door ajar indicator.





Visually inspect for obvious signs of mechanical and electrical damage.
3. If the inspection reveals an obvious concern that is readily repaired, correct the concern before continuing with Inspection and Verification.
4. If the concern remains after the inspection, use scan tool connected to the Data Link Connector (DLC) to retrieve continuous Diagnostic Trouble Codes (DTCs) and to execute On-Demand Self-Test diagnostics for the air suspension control module.
- If the On-Demand self-test is passed and no DTCs arc retrieved, go to the Symptom Chart to continue diagnostics.
- If DTCs are retrieved, go to Air Suspension Control Module Diagnostic Trouble Code (DTC) Index in this section.
- If the air suspension control module cannot be accessed by scan tool, go to Pinpoint Test A.

Self-Test
Verify that the following conditions are met before running the On-Demand Self-Test.
- All doors, liftgate, and liftgate glass must be closed.
- The transmission is in PARK.
- The BPP switch is not pressed during the test and the parking brake is not set.
- The accelerator pedal is not pressed during the test.
- The vehicle is not in 4L mode.
1. Fulfill the pre-conditions.
2. Install a battery charger for the On-Demand Self-Test to prevent battery drain.
3. Run the air suspension On-Demand Self-Test.
4. Record all listed DTCs.
5. Retrieve stored DTCs.
6. Troubleshoot any On-Demand Self-Test DTCs first.
7. Retest and clear DTCs after repairs.