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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. Verify that there are no air leaks in the system.
    • If a leak is found, repair or replace the leaking component as necessary.
  2. Ignition OFF, remove the ELC MDL fuse in the rear fuse block and disconnect the harness connector at the air pressure sensor.
  3. Test for less than 2.0 ohms between the low reference terminal at the harness connector and ground.
    • If greater than specified, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the air suspension control module.
  4. Ignition ON, verify that 4.8-5.2 volts exists between the 5-volt reference circuit terminal of the harness connector and ground.
    • If less than the specified range, test the 5-volt reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the air suspension control module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the air suspension control module.
  5. Verify the scan tool Air Pressure Sensor parameter is less than 0.5 volt.
    • If greater than the specified range, test the signal circuit terminal for a short to voltage. If the circuit tests normal, replace the air suspension control module.
  6. Install a 3A fused jumper wire between the signal circuit terminal and the 5-volt reference circuit terminal. Verify the scan tool Air Pressure Sensor parameter is greater than 4.8 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the air suspension control module.
  7. If all circuits test normal, test or replace the air pressure sensor.
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