Initial Inspection and Diagnostic Overview

1. Verify the customer concern.

2. Note: If the door ajar indicator is illuminated when all doors, the liftgate and the liftgate glass are closed, the air suspension will not work correctly. Repair the 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 NGS Tester 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 are retrieved, go to 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 the NGS Tester, go to Pinpoint Test A.

On-Demand Self-Test
Verify that the following conditions are met before performing the On-Demand Self-Test.
- All doors, liftgate and liftgate glass must be closed.
- The transmission is in PARK.
- The Brake Pedal Position (BPP) switch is not pressed during the test and the parking brake is not set.
- The accelerator pedal is not pressed during this test.
1. Fulfill the conditions before starting self-test.
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. Diagnose any On-Demand Self-Test DTCs first.
7. Retest and clear DTCs after repair.