B1320 – Driver Door Ajar Circuit Open
The ODBII code B1320 Driver Door Ajar Circuit Open indicates a malfunction in the driver door ajar switch or its circuit, signaling that the system detects an open circuit when the door is closed.
The severity of ODBII code B1320 Driver Door Ajar Circuit Open is generally considered low.
Common Causes For: B1319 Driver Door Ajar Circuit Failure
- Faulty door ajar switch
- Damaged wiring or connectors
- Faulty body control module (BCM)
- Misaligned door or latch
- Corrosion at electrical connections
- Broken or frayed wires
- Faulty door latch assembly
Common misdiagnosis for B1320 Driver Door Ajar Circuit Open
- Faulty door latch assembly
- Malfunctioning door switch
- Wiring issues or shorts
- Body control module (BCM) failure
- Incorrectly installed or damaged door seal
- Battery or electrical system problems
- Faulty keyless entry system
- Software glitches in the vehicle’s computer system
Common Troubleshooting Steps
The OBD-II code B1320 indicates a problem with the driver door ajar circuit, specifically that the circuit is open. This can lead to issues such as the vehicle not recognizing when the driver’s door is open or closed, which can affect various systems like interior lights, alarm systems, and more. Here are some common troubleshooting steps to diagnose and potentially resolve the issue:
- Visual Inspection: **Check Door Switch: Inspect the door ajar switch located in the door frame or on the door latch. Look for any signs of damage, corrosion, or disconnection.
- **Wiring Inspection: Examine the wiring harness and connectors leading to the door switch for any signs of wear, fraying, or disconnection.
- Test the Door Switch: **Multimeter Test: Use a multimeter to test the continuity of the door switch. With the door closed, the switch should show continuity (closed circuit), and when the door is open, it should show no continuity (open circuit).
- **Manual Activation: Manually activate the door switch to see if it registers correctly in the vehicle’s system.
- Check for Faulty Connections: **Connector Inspection: Ensure that all connectors related to the door ajar circuit are securely connected and free of corrosion.
- **Ground Connections: Check the ground connections for the door switch and ensure they are clean and secure.
- Scan for Additional Codes: **OBD-II Scanner: 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): **BCM Functionality: The BCM often controls the door ajar circuit. Check for any faults in the BCM that may be causing the issue.
- **Software Updates: Ensure that the BCM has the latest software updates, as manufacturers sometimes release updates to fix known issues.
- Check for Short Circuits: **Wiring Short: Inspect the wiring for any shorts to ground or power that could cause the circuit to remain open.
- **Resistance Test: Use a multimeter to check for resistance in the circuit. High resistance could indicate a problem.
- Test the System: **Reassemble and Test: After making any repairs or adjustments, reassemble the components and test the system to see if the code returns.
- **Clear Codes: Clear the trouble codes using the OBD-II scanner and see if the code reappears after a test drive.
- Consult Repair Manual: **Manufacturer Specifications: Refer to the vehicle’s repair manual for specific diagnostic procedures and specifications related to the door ajar circuit.
- Professional Help: If the issue persists after performing these steps, consider seeking help from a professional mechanic or dealership, as they may have specialized tools and knowledge to diagnose the problem accurately. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1320 code.