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Air Suspension Control Module Diagnostics

  1. Connect battery charger. Use of air compressor will drain battery if used for extended periods.
  2. Connect scan tool to DLC. Perform on-demand self-test. Retrieve all DTCs. Clear all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  .
  3. Using NGS tester, trigger the following active commands to raise vehicle. Run air compressor for about 30 seconds:
    • REAR FILL
    • GATEVALVE
    • COMPRESSR

    Using NGS tester, trigger the following active commands to lower vehicle:

    • REAR FILL
    • GATEVALVE
    • VENT

  4. Retrieve all stored DTCs. Compare DTCs to ELECTRONIC AIR SUSPENSION SYSTEM DEFINITIONS  table. Service DTCs as necessary. Clear all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  .
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