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Home >> Chevrolet >> 2006 >> Impala SS >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Computer/Integrating Systems >> Diagnostic Information and Procedures >> Retained Accessory Power (RAP) Malfunction >> Circuit/System Testing

Circuit/System Testing

  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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