WOMS
B code body Medium severity

B1394 Power Door Memory Lock Relay Circuit Short To Battery

The OBD2 code B1394 indicates a short circuit in the power door memory lock relay circuit, meaning there is an unintended connection to the battery, which can cause the relay to malfunction

Definition

The OBD2 code B1394 indicates a short circuit in the power door memory lock relay circuit, meaning there is an unintended connection to the battery, which can cause the relay to malfunction

Common causes

  • Shorted wiring or connectors
  • Faulty power door memory lock relay
  • Malfunctioning door lock control module
  • Corroded or damaged electrical connections
  • Faulty door lock actuator
  • Incorrectly installed aftermarket accessories
  • Battery voltage issues or fluctuations

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 diagnosed relay issues
  • Software or programming errors in the vehicle's computer system

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

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

  2. 2. Check Alternator Output

    Verify that the alternator is functioning properly and providing adequate voltage

  3. 3. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors related to the power door memory lock relay for any signs of damage, corrosion, or loose connections

  4. 4. Relay Condition

    Check the relay itself for any signs of damage or overheating

  5. 5. Test the Relay

    Relay Functionality: Use a multimeter to test the relay. You can do this by applying power to the relay and checking if it clicks and operates as expected

  6. 6. Swap with a Known Good Relay

    If possible, swap the suspect relay with a known good one to see if the issue persists

  7. 7. Check for Short Circuits

    Continuity Testing: Use a multimeter to check for continuity in the wiring associated with the power door memory lock relay. Look for any shorts to ground or to battery voltage

  8. 8. Inspect Ground Connections

    Ensure that all ground connections are clean and secure

  9. 9. Scan for Additional Codes

    Check for Other 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 Door Lock Actuators

    Actuator Functionality: Check the door lock actuators for proper operation. A malfunctioning actuator can sometimes cause issues with the relay circuit

  11. 11. Wiring to Actuators

    Inspect the wiring leading to the door lock actuators for damage or shorts

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

    BCM Functionality: If all other components check out, the issue may lie within the Body Control Module. Ensure that it is functioning correctly and is not sending erroneous signals

  13. 13. Software Updates

    Check if there are any software updates available for the BCM that may address known issues

  14. 14. Consult Wiring Diagrams

    Refer to Service Manual: Use the vehicle’s service manual to refer to wiring diagrams for the power door memory lock relay circuit. This can help identify potential problem areas

  15. 15. Perform a Reset

    Clear Codes: After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  16. 16. Seek Professional Help

    If the issue persists after following 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 B1394 code