Inspection and Verification

Inspection and Verification

CAUTION: Before diagnosing the air suspension system, carry out the air suspension module 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 supply lines 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 Instrument Panel, Gauges and Warning Indicators.

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. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
^ check that the program card is correctly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.

5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
6. Carry out the DATA LINK DIAGNOSTIC TEST. If the diagnostic tool responds with:
^ CKT914, CKT915 or CKT70 ALL ECUs NO RESP/NOT EQUIP, refer to Information Bus (Module Communications Network).
^ NO RESP/NOT EQUIP for air suspension module, GO to Pinpoint Test A. Test A: No Communication With The Air Suspension Module
^ SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the air suspension module and system pneumatic test.

7. If the DTCs retrieved are related to the concern, GO to Air Suspension Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures
8. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures