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Home >> Chevrolet >> 2005 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 584 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Trunk Release Inoperative >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Sky. However, it is still accessible from the selected car via links, so may be relevant.

Rear Compartment Lid Release Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
  2. Test for less than 1.0 ohm of resistance between the ground circuit terminal A and ground.
    • If greater than 1.0 ohm, test the ground circuit terminal A for an open/high resistance.
  3. Ignition ON, verify the scan tool trunk release switch parameter is INACTIVE.
    • If not the specified value, test the signal circuit terminal C for a short to ground. If circuit tests normal, replace the BCM.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal C and the ground circuit terminal A. Verify the scan tool trunk release switch parameter is ACTIVE.
    • If not the specified value, test the signal circuit terminal C for a short to voltage or an open/high resistance. If circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the rear compartment lid release switch.

Rear Compartment Lid Release Malfunction

  1. Ignition OFF, disconnect the trunk release relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the relay switch controlled output circuit and ground.
    • If the test lamp illuminates, test the controlled output circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the relay coil B+ circuit and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the relay switch controlled output circuit for a short to ground. If the circuit tests normal, test or replace the trunk release relay.
  4. Verify that a test lamp illuminates between the relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  5. Disconnect the harness connector at the folding top cover actuator.
  6. Test for less than 1.0 ohm of resistance between the folding top cover actuator ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the folding top cover actuator.
  8. Connect a 3-amp fused jumper wire between the relay switch B+ circuit and the relay switch controlled output circuit. Verify the folding top cover actuator is activated.
    • If the folding top cover actuator does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the folding top cover actuator.
  9. Disconnect the harness connector at the rear compartment lid release actuator.
  10. Test for less than 1.0 ohm of resistance between the rear compartment lid release actuator ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  11. Connect the harness connector at the rear compartment lid release actuator.
  12. Connect a 3-amp fused jumper wire between the relay switch B+ circuit and the relay switch controlled output circuit. Verify the rear compartment lid release actuator is activated.
    • If the rear compartment lid release actuator does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid release actuator.
  13. Connect a test lamp between the relay coil B+ circuit and the relay coil control circuit.
  14. Command the trunk release 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 BCM.
    • 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 BCM.
  15. If all circuits test normal, test or replace the trunk release relay.
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