B1310 – Power Door Unlock Circuit Failure

The ODBII code B1310 indicates a failure in the power door unlock circuit, which may involve issues with the wiring, switches, or the door lock actuator.

The severity of ODBII code B1310 Power Door Unlock Circuit Failure is generally considered moderate.

Common Causes For: B1309 Power Door Lock Circuit Short To Ground

• Faulty door lock actuator
• Damaged wiring or connectors
• Failed power door lock switch
• Blown fuse
• Malfunctioning body control module (BCM)
• Poor ground connection
• Corroded terminals

Common misdiagnosis for B1310 Power Door Unlock Circuit Failure

• Faulty door lock actuator
• Wiring issues or shorts in the door harness
• Malfunctioning body control module (BCM)
• Defective power door lock switch
• Low battery voltage or weak battery
• Corroded connectors or terminals
• Software or programming issues in the vehicle’s computer system

Common Troubleshooting Steps

The OBD-II code B1310 indicates a “Power Door Unlock Circuit Failure.” This code typically relates to issues with the power door lock system in a vehicle. 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 lock system. A blown fuse can interrupt the circuit and trigger the B1310 code.
• Examine Wiring and Connectors:
• Inspect 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 harnesses in the door and the body of the vehicle.
• Test the Door Lock Actuators:
• Manually test the door lock actuators to ensure they are functioning correctly. You can do this by applying direct power to the actuators to see if they respond.
• Check the Door Lock Switches:
• Test the door lock switches for proper operation. A faulty switch can prevent the door locks from functioning correctly.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Inspect the Body Control Module (BCM):
• The BCM controls the power door locks. Check for any faults in the BCM or its programming. If necessary, reprogram or replace the BCM.
• Look for Ground Issues:
• Ensure that all ground connections related to the power door lock system are secure and free of corrosion.
• Perform a Visual Inspection:
• Look for any signs of water intrusion or damage in the door panels, as moisture can affect electrical components.
• Consult Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to trace the power door lock circuit and identify any potential issues. 1
• Test with a Multimeter:
• Use a multimeter to check for voltage and continuity in the power door lock circuit. This can help identify where the failure is occurring. 1
• Reset the Code:
• After performing repairs, clear the code using an OBD-II scanner and see if it returns. If the code reappears, further investigation may be needed. If these steps do not resolve the issue, it may be necessary to consult a professional mechanic or technician who has experience with the specific make and model of your vehicle.