WOMS
B code body Medium severity

B1396 Power Door Lock Circuit Short To Battery

The OBD2 code B1396 indicates a short circuit in the power door lock circuit, meaning there is an unintended connection to the battery, which can cause the door locks to malfunction

Definition

The OBD2 code B1396 indicates a short circuit in the power door lock circuit, meaning there is an unintended connection to the battery, which can cause the door locks to malfunction

Common causes

  • Shorted wiring or connectors
  • Faulty door lock actuator
  • Malfunctioning power door lock switch
  • Damaged or corroded ground connections
  • Faulty body control module (BCM)
  • Incorrectly installed aftermarket accessories
  • Water intrusion or moisture damage in electrical components

Common misdiagnoses

  • Faulty door lock actuator
  • Wiring harness issues
  • Malfunctioning body control module (BCM)
  • Defective power door lock switch
  • Shorted or damaged wiring
  • Battery issues or poor connections
  • Faulty relay or fuse related to door locks

Troubleshooting steps

  1. 1. Verify the Code

    Use an OBD-II scanner to confirm the presence of the B1396 code. Check for any additional codes that may provide more context

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harnesses and connectors related to the power door lock system for any signs of damage, fraying, or corrosion

  3. 3. Ground Connections

    Ensure that all ground connections are secure and free of corrosion

  4. 4. Check the Power Door Lock Switch

    Test the door lock switch for proper operation. A faulty switch can cause a short circuit

  5. 5. Use a multimeter to check for continuity and proper voltage at the switch

  6. 6. Examine the Door Lock Actuator

    Inspect the door lock actuator for any signs of damage or malfunction. A shorted actuator can cause the circuit to read as shorted to battery

  7. 7. Disconnect the actuator and check for continuity between the actuator terminals

  8. 8. Test the Circuit

    Use a multimeter to check the voltage and ground at the door lock circuit. Ensure that the voltage is within the expected range

  9. 9. Check for continuity in the wiring between the switch, actuator, and the body control module (BCM)

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

    If all other components check out, the BCM may be at fault. Inspect for any signs of damage or corrosion

  11. 11. If possible, test the BCM with a scan tool to see if it is functioning correctly

  12. 12. Look for Shorts

    Inspect the wiring for any shorts to ground or battery. This can be done by performing a resistance test on the wires

  13. 13. If a short is found, repair or replace the damaged wiring

  14. 14. Clear the Codes and Test Drive

    After performing repairs, clear the codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  15. 15. Consult a Professional

    If the issue persists after following these steps, it may be necessary to consult a professional mechanic or technician for further diagnosis.Additional Tips: - Always disconnect the battery before working on electrical components to avoid any accidental shorts or shocks. - Refer to the vehicle’s service manual for specific wiring diagrams and component locations. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1396 code