WOMS
B code body Medium severity

B1982 Driver’s Door Unlock Relay Circuit Failure

The OBD2 code B1982 indicates a malfunction in the driver's door unlock relay circuit, which may affect the operation of the door locks

Definition

The OBD2 code B1982 indicates a malfunction in the driver's door unlock relay circuit, which may affect the operation of the door locks

Common causes

  • Faulty door unlock relay
  • Damaged wiring or connectors in the circuit
  • Failed door lock switch
  • Malfunctioning body control module (BCM)
  • Short circuit in the wiring harness
  • Corrosion or poor connections at terminals
  • Faulty key fob or remote entry system
  • Blown fuse related to the door lock system

Common misdiagnoses

  • Faulty door lock actuator
  • Wiring issues or shorts in the door harness
  • Malfunctioning body control module (BCM)
  • Defective key fob or remote entry system
  • Issues with the power door lock switch
  • Battery or charging system problems
  • Software glitches in the vehicle's electronic systems
  • Faulty door latch assembly

Troubleshooting steps

  1. 1. Check the Vehicle’s Battery

    Ensure the battery is fully charged and in good condition. A weak battery can cause various electrical issues

  2. 2. Inspect Fuses

    Check the fuses related to the door locks and central locking system. A blown fuse can interrupt the circuit and trigger the code

  3. 3. Examine the Relay

    Locate the driver’s door unlock relay in the fuse box or relay panel

  4. 4. Test the relay for proper operation. You can swap it with a similar relay (if available) to see if the problem persists

  5. 5. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the driver’s door unlock circuit for any signs of damage, corrosion, or loose connections

  6. 6. Pay special attention to the wiring harness in the door, as it can be prone to wear and tear

  7. 7. Test the Door Lock Actuator

    The door lock actuator may be faulty. Test the actuator to ensure it is functioning correctly. You can do this by applying direct power to it to see if it operates

  8. 8. Check for Short Circuits

    Use a multimeter to check for short circuits in the wiring. Look for continuity where there shouldn’t be any, which could indicate a short

  9. 9. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  10. 10. Inspect the Body Control Module (BCM)

    The BCM controls the door locks and may be malfunctioning. Check for any software updates or known issues with the BCM for your vehicle model

  11. 11. Perform a Reset

    After addressing any issues found, clear the trouble codes using an OBD-II scanner and see if the code returns after a test drive

  12. 12. Consult Repair Manual

    Refer to the vehicle’s repair manual for specific wiring diagrams and troubleshooting procedures related to the door lock system.1

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis. By following these steps, you should be able to identify and potentially resolve the issue related to the B1982 code