4-Wheel Vehicle Dynamic Suspension

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.