B1335 — Door Ajar RR Circuit Failure #

Note: The label for this code may vary depending on the vehicle manufacturer.

• Ford: Door Ajar RR Circuit Failure
• General Motors (GM): Right Rear Door Ajar Circuit Malfunction
• Toyota: Rear Right Door Switch Circuit Malfunction
• Chrysler: Right Rear Door Open Switch Circuit Error

Summary of the B1335 Code #

The B1335 diagnostic trouble code (DTC) indicates a malfunction within the right rear (RR) door ajar circuit. This circuit is responsible for informing the vehicle’s control module whether the right rear door is securely closed or open, typically by way of a door-ajar switch integrated into the door latch assembly. When the system detects a signal out of the expected range—whether due to a stuck switch, faulty wiring, or a communication error—it logs the B1335 code. This can result in various malfunctions, such as warning lamps staying illuminated or security systems not arming properly. Prompt attention to this code is advised to maintain both vehicle convenience and safety features.

Common Symptoms for Code B1335 #

When the B1335 code is set, you may notice several telltale symptoms. These issues often relate to the vehicle’s interior electronics and security systems, as the body control module (BCM) relies on accurate door status information. Look out for the following:

• Door ajar warning light stays on, even when all doors are closed
• Interior dome or courtesy lights remain illuminated after closing the doors
• Alarm system may not arm or may trigger unexpectedly
• Electric locks may not function as expected
• Chimes or warning sounds indicating a door is open

Most Likely Causes for Code B1335 #

Several issues can trigger the B1335 code, but some occur more frequently than others. Here is a ranked list of probable causes, starting with the most common:

1. Faulty right rear door ajar switch (the switch within the latch assembly may fail or stick)
2. Damaged or corroded wiring/connectors in the right rear door circuit
3. Poor ground connections at the door or body module
4. Faulty Body Control Module (BCM)
5. Physical damage to the door latch or misalignment preventing proper switch operation

Step-by-Step Diagnosis for Code B1335 #

Diagnosing a B1335 code requires systematic troubleshooting. Here’s a reliable step-by-step approach:

• Verify the code using a professional OBD-II scanner and record any additional codes.
• Visually inspect the right rear door latch area for physical damage, misalignment, or obvious corrosion.
• Test the operation of the right rear door ajar switch using a multimeter or scan tool data to check if the status changes when the door is opened and closed.
• Inspect the wiring harness and connectors between the door and the vehicle body for signs of wear, corrosion, or pinched wires—especially in the door jamb area.
• Check ground connections at the door and body control module for tightness and cleanliness.
• If all else checks out, consider performing continuity and resistance tests on the circuit from the door switch to the BCM.
• As a last resort, suspect a malfunctioning Body Control Module (BCM) and consult OEM diagnostic procedures before replacement.

Possible Repairs for Code B1335 #

Addressing the B1335 code generally means repairing or replacing the faulty part in the affected circuit. The repair you choose will depend on which cause you confirm during diagnosis:

• Replace a faulty or sticking right rear door ajar switch (usually part of the door latch assembly)
• Repair or replace damaged wiring or corroded connectors in the right rear door circuit
• Clean, tighten, or re-establish ground connections for the door and BCM
• Repair or realign the door latch assembly if physical misalignment is found
• Replace the BCM only if confirmed faulty by OEM-specified tests

Is It Safe to Drive with Code B1335? #

Yes, but with limitations. While the B1335 code typically does not affect the core drivability of your vehicle, it can compromise convenience and safety features such as alarm activation, automatic locking, and interior lighting. If you rely on your vehicle’s security system or frequently carry valuables, prompt repair is recommended. Additionally, driving with this code active may mask new, more critical faults if you become accustomed to warning lights being on.

Vehicles Most Commonly Affected by Code B1335 #

The B1335 code is most frequently found in certain makes and models, especially where the door ajar circuit design is susceptible to moisture or wear. Here are some examples:

• Ford F-Series (F-150, F-250, F-350, various years)
• Ford Explorer and Expedition
• Chevrolet Silverado and Tahoe
• GMC Sierra
• Toyota Camry and Highlander
• Chrysler Town & Country
• Jeep Grand Cherokee

Common Mistakes and Best Practices for B1335 #

Misdiagnosis and incomplete repairs are common with the B1335 code. Here’s what to avoid and what to do:

• Skipping the visual inspection and replacing parts prematurely
• Overlooking corroded or loose connections in the door jamb harness
• Forgetting to check and clean ground points
• Failing to confirm switch operation with a scan tool or by monitoring BCM data
• Always clear codes and verify repair by cycling the door and observing system operation

Quick FAQ for Code B1335 #

Still have questions? Here are quick answers to the most common concerns:

• Q: Will this code drain my battery?
  A: If the interior lights or warning chimes stay on due to the code, it can eventually drain the battery if left unaddressed.
• Q: Can I fix this myself, or do I need a professional?
  A: If you’re comfortable with basic wiring checks and have a multimeter, you can attempt diagnosis and repair. For anything involving the BCM or complex electronics, professional help is recommended.