WOMS
B code body Medium severity

B1310 Power Door Unlock Circuit Failure

The OBD2 code B1310 indicates a failure in the power door unlock circuit, which may involve issues with the wiring, switches, or the door lock actuator

Definition

The OBD2 code B1310 indicates a failure in the power door unlock circuit, which may involve issues with the wiring, switches, or the door lock actuator

Common causes

  • Faulty door lock actuator
  • Damaged wiring or connectors
  • Failed power door lock switch
  • Blown fuse
  • Malfunctioning body control module (BCM)
  • Poor ground connection
  • Corroded terminals

Common misdiagnoses

  • Faulty door lock actuator
  • Wiring issues or shorts in the door harness
  • Malfunctioning body control module (BCM)
  • Defective power door lock switch
  • Low battery voltage or weak battery
  • Corroded connectors or terminals
  • Software or programming issues in the vehicle's computer system

Troubleshooting steps

  1. 1. Check the Vehicle's Battery

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

  3. 3. Inspect Fuses

  4. 4. Check the fuses related to the power door lock system. A blown fuse can interrupt the circuit and trigger the B1310 code

  5. 5. Examine Wiring and Connectors

  6. 6. Inspect the wiring and connectors associated with the power door lock system for any signs of damage, corrosion, or loose connections. Pay special attention to the wiring harnesses in the door and the body of the vehicle

  7. 7. Test the Door Lock Actuators

  8. 8. Manually test the door lock actuators to ensure they are functioning correctly. You can do this by applying direct power to the actuators to see if they respond

  9. 9. Check the Door Lock Switches

  10. 10. Test the door lock switches for proper operation. A faulty switch can prevent the door locks from functioning correctly

  11. 11. Scan for Additional Codes

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

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

  14. 14. The BCM controls the power door locks. Check for any faults in the BCM or its programming. If necessary, reprogram or replace the BCM

  15. 15. Look for Ground Issues

  16. 16. Ensure that all ground connections related to the power door lock system are secure and free of corrosion

  17. 17. Perform a Visual Inspection

  18. 18. Look for any signs of water intrusion or damage in the door panels, as moisture can affect electrical components

  19. 19. Consult Wiring Diagrams

  20. 20. Refer to the vehicle’s wiring diagrams to trace the power door lock circuit and identify any potential issues. 1

  21. 21. Test with a Multimeter

  22. 22. Use a multimeter to check for voltage and continuity in the power door lock circuit. This can help identify where the failure is occurring. 1

  23. 23. Reset the Code

  24. 24. After performing repairs, clear the code using an OBD-II scanner and see if it returns. If the code reappears, further investigation may be needed. If these steps do not resolve the issue, it may be necessary to consult a professional mechanic or technician who has experience with the specific make and model of your vehicle