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Home >> Chevrolet >> 2015 >> Impala Limited LS >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless Entry System And Remote Functions >> Diagnostic Information and Procedures >> Power Door Locks Malfunction >> Circuit/System Testing

Circuit/System Testing

Door Lock Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
  2. Test for less than 1 Ω 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 Door Lock Sw 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. Install a 3A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool Door Lock Sw 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.
  5. Verify the scan tool Door Unlock Sw 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.
  6. Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Door Unlock Sw 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 door lock switch.

Driver Door Lock Malfunction

  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 driver door to LOCK and UNLOCK by using the driver door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
    • If the test lamp does not illuminate during either of the commands and the B+ circuit fuse is open, test either control circuit for a short to ground. If the circuit tests normal, test or replace the driver door lock.
    • If the test lamp does not illuminate during either of the commands and the B+ circuit fuse is good, test either control circuit for an open/high resistance. If the circuit tests normal, refer to I/P Fuse Block Test.
  4. If all circuits test normal, test or replace the driver door latch.

Passenger Door Lock Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate passenger or rear door latch.
  2. Ignition ON, connect a test lamp between the control circuit terminals listed below:
    • Terminal 2 and terminal 3 - left rear door latch
    • Terminal 5 and terminal 6 - right rear door latch
    • Terminal 5 and terminal 6 - passenger door latch
  3. Command the door to LOCK and UNLOCK by using the driver door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
    • If the test lamp does not illuminate during either of the commands and the B+ circuit fuse is open, test either control circuit for a short to ground. If the circuit tests normal, test or replace the passenger or rear door latch.
    • If the test lamp does not illuminate during either of the commands and the B+ circuit fuse is good, test either control circuit for an open/high resistance. If the circuit tests normal, refer to I/P Fuse Block Test.
  4. If all circuits test normal, test or replace the passenger or rear door latch.

I/P Fuse Block Test

  1. Ignition OFF, disconnect the X1 harness connector at the I/P fuse block.
  2. Test for less than 1 Ω between the ground circuit terminal J1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between control circuit terminal K4 and ground.
  4. Ignition ON, command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Connect a test lamp between control circuit terminal K5 and B+.
  6. Command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.
    • 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 and open/high resistance. If the circuit tests normal, replace the BCM.
  7. Connect a test lamp between control circuit terminal K6 and B+.
  8. Command the driver door to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.
    • 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 and open/high resistance. If the circuit tests normal, replace the BCM.
  9. If all circuits test normal, replace the I/P fuse block.
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