LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2010 >> Traverse LT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 480 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Power Door Locks Malfunction (With AXE) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Driver Door Lock Malfunction

  1. Ignition OFF, verify the harness connector for the driver door latch is firmly seated and secure.
    • If not the specified condition, seat and secure the connector and perform the Circuit/System Verification.
  2. If the harness connector for the driver door latch is firmly seated and secure, refer to Driver Door Lock Circuit Testing.

Driver Door Lock Circuit Testing

  1. Ignition OFF, disconnect the harness connector at the driver door latch.
  2. Ignition ON, connect a test lamp between the control circuit terminal 3 and control circuit terminal 2.
  3. Command the Door Lock/Unlock with a scan tool. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the driver door lock/window switch.
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the driver door lock/window switch.
  4. If the circuits test normal, test or replace the driver door latch.

Passenger Door Lock Malfunction

  1. Ignition OFF, verify the harness connector for the passenger door latch is firmly seated and secure.
    • If not the specified condition, seat and secure the harness connector and perform the Circuit/System Verification.
  2. If the harness connector for the passenger door latch is firmly seated and secure, refer to Passenger Door Lock Circuit Testing.

Passenger Door Lock Circuit Testing

  1. Ignition OFF, disconnect the harness connector at the passenger door latch.
  2. Ignition ON, connect a test lamp between the control circuit terminal 5 and control circuit terminal 6.
  3. Command the Door Lock/Unlock with a scan tool. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the passenger door lock/window switch.
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the passenger door lock/window switch.
  4. If the circuits test normal, test or replace the passenger door latch.

Door Unlock Relay Malfunction

  1. Ignition OFF, disconnect the UNLCK relay.
  2. Test for less than 1 Ω between the ground circuit terminal 87A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 30 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 86 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, test or replace the UNLCK relay.
  5. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  6. Connect a test lamp between the control circuit terminal 85 and the B+ circuit terminal 86.
  7. Command the driver door to UNLOCK by using the driver door lock/window switch. The test lamp should illuminate when commanding the UNLOCK state.
    • 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.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
  8. Ignition OFF, connect the UNLCK relay and disconnect the harness connector at the driver door latch.
  9. Test for less than 5 Ω between the control circuit terminal listed below and ground:
    • Left rear door latch terminal 2.
    • Right rear door latch terminal 5.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the UNLCK relay.
  10. Connect a test lamp between the control circuit terminal listed below and ground:
    • Left rear door latch terminal 2.
    • Right rear door latch terminal 5.
  11. Ignition ON, command the Passenger Door(s) Unlock with a scan tool. The test lamp should turn ON when commanding the UNLOCK state.
    • If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the UNLCK relay.
  12. If all circuits test normal, test or replace the door latch.

Door Lock Relay Malfunction

  1. Ignition OFF, disconnect the LCK relay.
  2. Test for less than 1 Ω between the ground circuit terminal 87A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 30 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 86 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, test or replace the LCK relay.
  5. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  6. Connect a test lamp between the circuit terminal 85 and the B+ circuit terminal 86.
  7. Command the rear doors unlock 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 OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
  8. Ignition OFF, connect the LCK relay and disconnect the harness connector at the appropriate door latch.
  9. Test for less than 5 Ω between the control circuit terminal of the door lock listed below and ground:
    • Left rear door latch terminal 3.
    • Right rear door latch terminal 6.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the LCK relay.
  10. Connect a test lamp between the control circuit terminal listed below and ground:
    • Left rear door latch terminal 3.
    • Right rear door latch terminal 6.
  11. Ignition ON, command the Lock All Doors with a scan tool. The test lamp should turn ON when commanding the LOCK state.
    • If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the LCK relay.
  12. If all circuits test normal, test or replace the door latch.
scientia non olet · About LEMON Manuals