B1565 – Door Ajar Circuit Short To Battery

The ODBII code B1565 indicates a fault in the door ajar circuit, specifically that there is a short to battery, meaning the circuit is receiving constant power when it shouldn’t, potentially causing the vehicle to think a door is always open.

The severity of ODBII code B1565 is moderate.

Common Causes For: B1564 Door Ajar Circuit Open

• Faulty door ajar switch
• Shorted wiring or connectors
• Corroded terminals
• Malfunctioning body control module (BCM)
• Improperly closed door
• Water intrusion or moisture damage
• Damaged or frayed wiring harness

Common misdiagnosis for B1565 Door Ajar Circuit Short To Battery

• Faulty door switch
• Wiring issues
• Body control module (BCM) failure
• Shorted wiring harness
• Malfunctioning door latch assembly
• Incorrectly installed or damaged door seal
• Battery or charging system problems

Common Troubleshooting Steps

The OBD-II code B1565 indicates a “Door Ajar Circuit Short to Battery” issue, which typically means that the vehicle’s body control module (BCM) is detecting a problem with the door ajar switch circuit. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Visual Inspection: **Check Door Switches: Inspect the door ajar switches for any visible damage or corrosion. Ensure that they are not stuck in the “on” position.
• **Wiring Inspection: Look for damaged, frayed, or shorted wiring in the door harness and connectors. Pay special attention to areas where the wiring may flex or rub against other components.
• Check for Faulty Components: **Test Door Ajar Switches: Use a multimeter to test the continuity of the door ajar switches. They should show continuity when the door is open and no continuity when the door is closed.
• **Inspect the BCM: If the switches are functioning correctly, the issue may lie within the body control module itself. Check for any signs of damage or malfunction.
• 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.
• Check for Short Circuits: **Test for Shorts: With the vehicle off, use a multimeter to check for continuity between the door ajar circuit and the battery voltage. A short circuit will show continuity where it shouldn’t.
• **Inspect Ground Connections: Ensure that all ground connections related to the door ajar circuit are secure and free of corrosion.
• Repair or Replace Faulty Components: If any faulty switches, wiring, or connectors are found, repair or replace them as necessary.
• If the BCM is determined to be faulty, it may need to be reprogrammed or replaced.
• Clear Codes and Test Drive: After making repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: If the issue persists, consult the vehicle’s service manual for specific diagnostic procedures related to the door ajar circuit and BCM.
• Professional Help: If you are unable to resolve the issue, consider seeking help from a professional mechanic or automotive technician who has experience with electrical systems. By following these steps, you should be able to identify and resolve the issue related to the B1565 code.