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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 644 (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 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

Door Lock Switch Malfunction

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

Door Lock Malfunction

  1. Ignition OFF, disconnect the harness connector C4 at the BCM.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal E12 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition OFF, disconnect the harness connector at the appropriate Door Latch.
  4. Ignition OFF, test for less than 1 ohm of resistance between the control circuit terminal 2 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the BCM.
  5. Ignition OFF, test for less than 1 ohm of resistance between the control circuit terminal 3 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the BCM.
  6. Connect a test lamp between control circuit terminal 2 and control circuit terminal 3.
  7. Ignition ON, command the Door Latch to LOCK and UNLOCK with a scan tool. The test lamp should turn ON when commanding the LOCK and UNLOCK states.
    • If the test lamp remains OFF during either of the commands and the circuit fuse is good, test for a short to ground on either control circuit. If the circuits test normal, replace the BCM.
    • If the test lamp is always OFF and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the Door Latch.
  8. If all circuits test normal, test or replace the appropriate Door Latch.
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