B1394 – Power Door Memory Lock Relay Circuit Short To Battery

The ODBII 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.

The severity of ODBII code B1394 is moderate.

Common Causes For: B1393 Power Door Memory Lock Relay Circuit Open

• 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 misdiagnosis for B1394 Power Door Memory Lock Relay Circuit Short To Battery

• 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

Common Troubleshooting Steps

When dealing with OBD-II code B1394, which indicates a “Power Door Memory Lock Relay Circuit Short To Battery,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• 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.
• **Check Alternator Output:** Verify that the alternator is functioning properly and providing adequate voltage.
• 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.
• **Relay Condition:** Check the relay itself for any signs of damage or overheating.
• 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.
• **Swap with a Known Good Relay:** If possible, swap the suspect relay with a known good one to see if the issue persists.
• 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.
• **Inspect Ground Connections:** Ensure that all ground connections are clean and secure.
• 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.
• 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.
• **Wiring to Actuators:** Inspect the wiring leading to the door lock actuators for damage or shorts.
• 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.
• **Software Updates:** Check if there are any software updates available for the BCM that may address known issues.
• 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.
• 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.
• 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.