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HOMESERVICE MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 164 (POWER DOOR LOCK SYSTEM AND RELEASE SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B251A-B251FCIRCUIT/SYSTEM TESTING
2013 Buick Regal Turbo Premium, Standard Trans

Circuit/System Testing

2013 Buick Regal Turbo Premium, Standard TransSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Driver Door Latch Malfunction

  1. Ignition OFF, disconnect the X4 harness connector at the K84 keyless entry control module.
  2. Test for infinite resistance between the control circuit terminal 3 and ground.
    • If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
  3. Ignition OFF, connect the X4 harness connector at the K84 keyless entry control module.
  4. Disconnect the harness connector at the A23D door latch assembly - driver.
  5. Connect a test lamp between the control circuit terminal 5 and control circuit terminal 10.
  6. Pull and release the exterior driver door handle, the test lamp should briefly illuminate while the exterior door handle is being pulled.
    • If the test lamp is always OFF, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K84 keyless entry control module.
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the K84 keyless entry control module.
  7. If all circuits test normal, test or replace the A23D door latch assembly - driver.

Passenger and Rear Door Release Command Inoperative

  1. Ignition OFF, disconnect the X4 harness connector at the K84 keyless entry control module.
  2. Test for infinite resistance between the control circuit terminal 14 and ground.
    • If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
  3. If all circuits test normal, replace the K84 keyless entry control module.

Passenger or Rear Door Latch Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
  2. Connect a test lamp between the control circuit terminal 5 and control circuit terminal 10:
  3. Pull and release the appropriate exterior door handle, the test lamp should briefly illuminate while the exterior door handle is being pulled.
    • If the test lamp is always OFF, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K84 keyless entry control module.
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the K84 keyless entry control module.
  4. If all circuits test normal, test or replace the A23 door latch assembly.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.