WOMS
B code body Medium severity

B1393 Power Door Memory Lock Relay Circuit Open

The OBD2 code B1393 indicates that there is an open circuit in the power door memory lock relay, which affects the operation of the door locking system

Definition

The OBD2 code B1393 indicates that there is an open circuit in the power door memory lock relay, which affects the operation of the door locking system

Common causes

  • Faulty power door memory lock relay
  • Open or shorted wiring in the relay circuit
  • Corroded or damaged connectors
  • Faulty door lock control module
  • Blown fuse related to the door lock system
  • Malfunctioning body control module (BCM)

Common misdiagnoses

  • Faulty door lock actuator
  • Malfunctioning body control module (BCM)
  • Wiring issues or shorts in the door harness
  • Defective power door lock switch
  • Battery or charging system problems
  • Incorrectly programmed key fob or remote
  • Issues with the vehicle's security system

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information about the power door memory lock relay circuit and its components

  2. 2. Visual Inspection

    Inspect the wiring and connectors associated with the power door lock system. Look for any signs of damage, corrosion, or loose connections

  3. 3. Check the relay itself for any physical damage

  4. 4. Test the Relay

    Locate the power door memory lock relay in the fuse box or relay panel

  5. 5. Use a multimeter to test the relay for continuity. If the relay is faulty, replace it with a new one

  6. 6. Check Fuses

    Inspect the fuses related to the power door locks and the relay circuit. Replace any blown fuses

  7. 7. Inspect the Door Lock Actuators

    Check the door lock actuators for proper operation. If an actuator is malfunctioning, it may cause issues with the relay circuit

  8. 8. Test the Circuit

    Use a multimeter to check for voltage at the relay terminals when the door lock switch is activated. If there is no voltage, trace the wiring back to the switch and check for continuity

  9. 9. Check for ground connections as well, ensuring that the relay has a proper ground

  10. 10. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue

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

    The BCM controls the power door locks. If all other components check out, the BCM may be faulty. Testing or reprogramming the BCM may be necessary

  12. 12. Check for Short Circuits

    Inspect the wiring harness for any signs of short circuits or pinched wires that could cause an open circuit

  13. 13. Clear the Code and Test Drive

    After performing repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.1

  14. 14. Consult a Professional

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1393 code