B1333 – Decklid Ajar Rear Door Circuit Short To Battery

The ODBII code B1333 indicates a malfunction in the rear door’s decklid ajar circuit, specifically a short circuit to the battery, which suggests that the system is detecting an open or shorted condition in the wiring or components related to the rear door’s ajar sensor.

The severity of ODBII code B1333 is moderate.

Common Causes For: B1332 Decklid Ajar Rear Door Circuit Open

• Shorted wiring in the decklid ajar circuit.
• Faulty decklid ajar switch.
• Corroded or damaged connectors.
• Malfunctioning body control module (BCM).
• Improperly installed or damaged wiring harness.

Common misdiagnosis for B1333 Decklid Ajar Rear Door Circuit Short To Battery

• Faulty decklid ajar switch
• Wiring issues or shorts in the harness
• Malfunctioning body control module (BCM)
• Defective rear door latch assembly
• Corroded connectors or terminals
• Issues with the vehicle’s alarm system
• Problems with the power distribution system

Common Troubleshooting Steps

The OBD-II code B1333 indicates a problem with the decklid (or rear door) ajar circuit, specifically a short to battery. This can prevent the vehicle’s systems from recognizing whether the rear door is closed or open, which can affect features like the trunk light, alarm system, or other related functions. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Visual Inspection: **Wiring and Connectors: Inspect the wiring harness and connectors associated with the decklid ajar switch. Look for any signs of damage, fraying, or corrosion.
• **Switch Condition: Check the decklid ajar switch for any physical damage or wear. Ensure it is properly mounted and functioning.
• Check for Shorts: **Continuity Test: Use a multimeter to check for continuity in the wiring. Look for any shorts to ground or battery voltage in the circuit.
• **Inspect Ground Connections: Ensure that all ground connections related to the decklid ajar circuit are secure and free of corrosion.
• Test the Decklid Ajar Switch: **Functionality Test: Manually operate the decklid ajar switch to see if it properly opens and closes the circuit. You can do this by checking the resistance across the switch terminals when the switch is activated and deactivated.
• **Bypass Test: Temporarily bypass the switch to see if the code clears. If it does, the switch may be faulty.
• Scan for Additional Codes: **Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Inspect Related Components: **Body Control Module (BCM): If the wiring and switch are in good condition, the issue may lie within the BCM. Check for any faults or updates related to the BCM.
• **Fuses and Relays: Inspect any fuses or relays associated with the decklid ajar circuit to ensure they are functioning properly.
• Clear the Code and Test Drive: After performing the above checks and repairs, clear the code using an OBD-II scanner and 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 B1333 code. This may provide additional insights or steps tailored to your vehicle’s make and model.
• Professional Diagnosis: If you are unable to resolve the issue, consider seeking help from a professional mechanic or automotive technician who has experience with electrical systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the B1333 code.