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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the air suspension compressor exhaust solenoid.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal and ground.
    • If the test lamp does not illuminate, test for the following conditions listed below. If all circuits test normal, replace the air suspension compressor assembly.
      • An open, short to ground, or short to voltage in the air suspension exhaust valve solenoid control circuit
      • A short to ground in one of the B+ or 5-volt reference circuits from the air suspension control module
      • A short to voltage in one of the position sensor low reference circuits
  3. Connect a test lamp between the B+ circuit terminal and the control circuit terminal.
  4. Command the exhaust solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the air suspension control module.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the air suspension control module.
  5. If all circuits test normal, replace the air suspension compressor assembly.
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