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Circuit/System Testing

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the RAP relay.
  2. Test for less than 1.0 ohm of resistance between the relay coil ground circuit and ground.
    • If greater than 1.0 ohm, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the RAP relay control circuit and ground.
  4. Command the RAP relay 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 remains ON all the time, test for a short to voltage on the relay coil control circuit. If the circuit tests normal, replace the BCM.
    • If the test lamp remains OFF all the time, test for a short to ground or open/high resistance on the relay coil control circuit. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the RAP relay.
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