B1563 – Door Ajar Circuit Failure

The ODBII code B1563 indicates a malfunction in the door ajar circuit, which may suggest that the vehicle’s system is detecting an issue with the door’s open/closed status, potentially causing false alerts or preventing the door from being recognized as closed.

The severity of ODBII code B1563 Door Ajar Circuit Failure is generally considered moderate.

Common Causes For: B1562 Door Lock Cylinder Circuit Short To Ground

• Faulty door ajar switch
• Damaged wiring or connectors
• Short circuit in the door ajar circuit
• Corroded terminals
• Malfunctioning body control module (BCM)
• Misaligned door or latch
• Water intrusion or moisture damage

Common misdiagnosis for B1563 Door Ajar Circuit Failure

• Faulty door switch
• Wiring issues
• Body control module (BCM) failure
• Faulty door latch assembly
• Malfunctioning instrument cluster
• Battery or charging system problems
• Ground connection issues
• Software glitches in the vehicle’s computer system

Common Troubleshooting Steps

The OBD-II code B1563 indicates a “Door Ajar Circuit Failure,” which typically means there is an issue with the door ajar switch or the related wiring and connectors. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Vehicle’s Manual: Refer to the vehicle’s service manual for specific information about the door ajar circuit and the components involved.
• Visual Inspection:
• Inspect the door ajar switch for any visible damage or wear.
• Check the wiring harness and connectors for fraying, corrosion, or loose connections.
• Ensure that the door is properly aligned and closes securely.
• Test the Door Ajar Switch:
• Use a multimeter to test the continuity of the door ajar switch. With the door closed, there should be continuity; when the door is open, there should be no continuity.
• If the switch is faulty, replace it.
• Check for Faulty Wiring:
• Inspect the wiring leading to the door ajar switch for any breaks or shorts.
• Use a multimeter to check for voltage and ground at the switch connector when the door is opened and closed.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any other related trouble codes that may provide more context for the issue.
• Inspect the Body Control Module (BCM):
• The BCM may be responsible for monitoring the door ajar circuit. Check for any faults or issues with the BCM.
• If necessary, reprogram or replace the BCM according to the manufacturer’s specifications.
• Check for Ground Issues:
• Ensure that the ground connections related to the door ajar circuit are secure and free of corrosion.
• Clear the Code and Test Drive:
• After performing repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code reappears.
• Consult a Professional:
• If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1563 code.