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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> Power Door Locks Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Passenger Door Lock Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the front passenger door lock switch.
  2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool RF Door Lock Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool RF Door Unlock Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3-amp fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool RF Door Lock Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Install a 3-amp fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool RF Door Unlock Switch parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the passenger door lock switch.

Driver Door Lock Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the front driver door lock switch.
  2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool All Door Lock Motors parameter is Off.
    • If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM.
  4. Verify the scan tool Passenger Door Unlock Motors parameter is Off.
    • If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.
  5. Install a 3-amp fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool All Door Lock Motors parameter is On.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  6. Install a 3-amp fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Passenger Door Unlock Motors parameter is On.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the driver door lock switch.

Driver Door Lock Malfunction

  1. Ignition OFF, disconnect the harness connector at the driver door lock actuator.
  2. Ignition ON, connect a test lamp between control circuit terminal 3 and control circuit terminal 2.
  3. Command the driver door to LOCK and UNLOCK using a scan tool. The test lamp should illuminate when changing between the commanded states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the BCM.
  4. If all circuits test normal, test or replace the driver door lock.

Door Lock Malfunction

  1. Ignition OFF, disconnect the X2 harness connector at the BCM.
  2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal 50 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 49 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or open/high resistance.
  4. Ignition OFF, connect the BCM and disconnect the harness connector at the appropriate passenger door lock.
  5. Ignition ON, connect a test lamp between the control circuit terminals of the appropriate door lock listed below.
    • Front passenger door lock terminals 5 and 6
    • LR passenger door lock terminals 2 and 3
    • RR passenger door lock terminals 5 and 6
  6. Command all doors to LOCK and UNLOCK using a scan tool. The test lamp should illuminate when changing between the commanded states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the BCM.
  7. If all circuits test normal, test or replace the appropriate passenger door lock.
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