B1392 – Power Door Memory Lock Relay Circuit Failure

The ODBII code B1392 indicates a malfunction in the power door memory lock relay circuit, which may affect the operation of the power door locks.

The severity of ODBII code B1392 is generally considered moderate.

Common Causes For: B1391 Oil Level Switch Circuit Failure

• Faulty power door memory lock relay
• Damaged wiring or connectors in the relay circuit
• Short circuit in the relay circuit
• Corroded terminals
• Failed body control module (BCM)
• Malfunctioning door lock actuator
• Poor ground connection

Common misdiagnosis for B1392 Power Door Memory Lock Relay Circuit Failure

• Faulty door lock actuator
• Bad power door lock switch
• Wiring issues or shorts in the door harness
• Malfunctioning body control module (BCM)
• Battery or charging system problems
• Incorrectly programmed key fob or remote
• Faulty relay or fuse related to the door lock system

Common Troubleshooting Steps

The OBD-II code B1392 indicates a “Power Door Memory Lock Relay Circuit Failure.” This code is typically associated with issues in the power door lock system, particularly with the relay that controls the memory function of the door locks. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check the Vehicle’s Battery:: Ensure the battery is fully charged and in good condition. A weak battery can cause various electrical issues.
• Inspect Fuses:: Check the fuses related to the power door locks and memory functions. Replace any blown fuses.
• Examine the Relay:: Locate the power door memory lock relay in the fuse box or relay panel. Inspect it for any signs of damage or corrosion.
• If possible, swap the relay with a similar one to see if the issue persists.
• Inspect Wiring and Connectors:: Check 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 harness leading to the relay and the door lock actuators.
• Test the Relay:: Use a multimeter to test the relay for continuity and proper operation. If the relay is faulty, replace it.
• Check Door Lock Actuators:: Inspect the door lock actuators for proper operation. If an actuator is malfunctioning, it may cause the relay to fail.
• Scan for Additional Codes:: Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue.
• Inspect the Body Control Module (BCM):: The BCM controls various electrical functions, including the power door locks. Check for any faults or issues with the BCM.
• If necessary, reprogram or replace the BCM.
• Perform a System Reset:: Disconnect the vehicle’s battery for a few minutes to reset the system. Reconnect and see if the code reappears.
• Consult Repair Manual:: Refer to the vehicle’s repair manual for specific wiring diagrams and troubleshooting procedures related to the power door lock system.1
• Seek Professional Help:: If the issue persists after performing the above steps, consider consulting 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 B1392 code. Always ensure safety precautions are taken when working with electrical systems in vehicles.