B1336 – Door Ajar RR Circuit Open

The ODBII code B1336 indicates that there is an open circuit in the rear right door ajar switch, meaning the vehicle’s system is detecting that the door is not properly signaling its open or closed status.

The severity of ODBII code B1336 Door Ajar RR Circuit Open is generally considered moderate.

Common Causes For: B1335 Door Ajar RR Circuit Failure

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

Common misdiagnosis for B1336 Door Ajar RR Circuit Open

• Faulty door switch
• Wiring issues
• Body control module malfunction
• Faulty door latch
• Grounding problems
• Short circuit in the wiring harness
• Incorrectly installed or damaged door seal
• Malfunctioning instrument cluster

Common Troubleshooting Steps

The OBD-II code B1336 indicates a “Door Ajar” condition specifically related to the right rear (RR) door circuit being open. This code typically points to an issue with the door ajar switch, wiring, or the vehicle’s body control module (BCM). Here are some common troubleshooting steps to diagnose and resolve the issue:

• Visual Inspection: **Check the Door Switch: Inspect the door ajar switch located in the right rear door. Look for any signs of damage, corrosion, or misalignment.
• **Wiring Inspection: Examine the wiring harness and connectors leading to the door switch for any signs of fraying, breaks, or corrosion.
• Test the Door Switch: **Multimeter Test: Use a multimeter to test the door switch. With the door closed, the switch should be in the “off” position (no continuity). When the door is open, the switch should show continuity.
• **Bypass Test: Temporarily bypass the switch by connecting the wires directly to see if the code clears. If it does, the switch may be faulty.
• Check for Faulty Connections: **Connector Inspection: Ensure that all connectors are securely attached and free of corrosion. Clean any corroded connectors and ensure a tight fit.
• **Ground Connections: Check the ground connections related to the door switch and BCM. A poor ground can cause erratic behavior.
• 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 the Body Control Module (BCM): **BCM Functionality: If the switch and wiring are in good condition, the issue may lie with the BCM. Check for any software updates or known issues with the BCM for your vehicle model.
• **Reprogramming: In some cases, reprogramming or resetting the BCM may resolve the issue.
• Clear the Code and Test Drive: **Clear the Code: After performing the above checks and repairs, clear the code using an OBD-II scanner.
• **Test Drive: Take the vehicle for a test drive to see if the code returns. Monitor the door ajar indicator on the dashboard.
• Consult a Professional: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1336 code.