B1835 – Door Unlock Disarm Output Circuit Open

The ODBII code B1835 indicates that there is an open circuit in the door unlock disarm output, which means the system is unable to properly signal the door unlock function.

The severity of ODBII code B1835 is moderate.

Common Causes For: B1834 Door Unlock Disarm Output Circuit Failure

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

Common misdiagnosis for B1835 Door Unlock Disarm Output Circuit Open

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

Common Troubleshooting Steps

The OBD-II code B1835 indicates a problem with the door unlock disarm output circuit, which is typically related to the vehicle’s security system or central locking mechanism. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information related to the B1835 code, including wiring diagrams and component locations.
• Inspect Wiring and Connectors:
• Visually inspect the wiring and connectors associated with the door lock and security system. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harnesses that connect to the door lock actuators and the body control module (BCM).
• Test the Door Lock Actuator:
• Use a multimeter to test the door lock actuator for continuity. If the actuator is faulty, it may need to be replaced.
• Check for proper voltage at the actuator when the door lock/unlock command is given.
• Check the Body Control Module (BCM):
• The BCM controls the door locking and unlocking functions. If it is malfunctioning, it may not send the correct signals to the door lock actuators.
• Inspect the BCM for any signs of damage or water intrusion.
• 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 Key Fob and Security System:
• If the vehicle uses a key fob for locking/unlocking, ensure that the fob is functioning properly. Replace the battery if necessary.
• Check the vehicle’s security system for any faults or issues that may affect the door locking mechanism.
• Perform a Reset:
• Sometimes, clearing the trouble code and resetting the vehicle’s computer can resolve temporary issues. After clearing the code, take the vehicle for a test drive to see if the code reappears.
• Consult a Professional:
• If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or automotive technician who has experience with the specific make and model of your vehicle. By following these troubleshooting steps, you should be able to identify the cause of the B1835 code and take appropriate action to resolve the issue.