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Circuit/System Testing

  1. Ignition OFF, disconnect the connector at the K5 Automatic Level Control Module, ignition ON/Vehicle in Service Mode.
  2. Test for less than 1 V between the K5 Automatic Level Control Module connector terminal 30 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  3. Ignition OFF.
  4. Disconnect harness connector at the G4 Automatic Level Control Air Compressor.
  5. Test for infinite resistance between K5 Automatic Level Control Module connector terminals listed below and ground.
    • Terminal 30
    • Terminal 46
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If Infinite resistance 
  6. Test for less than 2 Ω between G4 Automatic Level Control Air Compressor connector terminal 1 and K5 Automatic Level Control Module connector terminal 30.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  7. Test for less than 2 Ω between G4 Automatic Level Control Air Compressor connector terminal 2 and K5 Automatic Level Control Module connector terminal 46.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  8. Test for less than 2 Ω between the G4 Automatic Level Control Air Compressor connector terminal 2 and G3 Air Suspension Compressor connector terminal 1.
    • If 2 Ω or greater 

      Replace the G4 Automatic Level Control Air Compressor

    • Go to next step: If less than 2 Ω 
  9. Replace the K5 Automatic Level Control Module.
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