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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 both suspension position sensors.
  2. Test for less than 2.0 ohms between suspension position sensor low reference terminal 3 (LR) and terminal 1 (RR) and ground.
    • If greater than the specified range, test the low reference circuit for an open or high resistance. If all circuits test normal, replace the air suspension control module.
  3. Ignition ON, test for 4.8-5.2 volts between the sensor 5-volt reference circuit terminal 1 (LR) and terminal 3 (RR) of the harness connectors and ground.
    • If less that 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 that 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.
  4. Ignition OFF, reconnect the LR suspension position sensor.
  5. Ignition ON, test for 4.75-5.25 volts exists between the RR position sensor 5-volt reference circuit terminal 3 and ground.
    • If less than the specified range, test or replace the LR suspension position sensor.
  6. Test or replace RR suspension position sensor that is not connected.
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