What Does B1335 Mean?
This code indicates the Body Control Module (BCM) has detected a circuit malfunction in the rear right door ajar sensor or its wiring. The BCM monitors door ajar switches to determine if doors are open or closed for interior lighting, security systems, and instrument cluster warnings. A circuit failure means the BCM is receiving an abnormal signal (open circuit, short to ground, or short to power) from the rear right door ajar switch circuit.
Common Causes
45%
Faulty or misaligned rear right door ajar switch/sensor in door latch assembly
30%
Damaged, chafed, or corroded wiring between BCM and rear right door ajar switch
15%
Corroded or loose electrical connector at door ajar switch or BCM
10%
Failed Body Control Module (BCM) internal circuit
Diagnostic Steps
1
Step 1: Visually inspect the rear right door ajar switch in the door latch assembly for physical damage, misalignment, or debris preventing proper operation. Open and close the door while observing the switch plunger movement.
2
Step 2: Using a digital multimeter, backprobe the door ajar switch connector and verify proper voltage supply (typically 5-12V reference) and ground circuits with ignition on. Check for continuity changes when manually actuating the switch plunger.
3
Step 3: Inspect the wiring harness from the door jamb to the BCM, paying special attention to the flex area where the harness bends between the door and body. Check for chafing, pinching, or water intrusion damage.
4
Step 4: Disconnect the door ajar switch connector and measure resistance across the switch terminals while manually operating the plunger. Compare readings to manufacturer specifications (typically open circuit when door closed, 0-5 ohms when door open).
5
Step 5: If all wiring and switch tests are normal, access the BCM connector and verify circuit continuity and resistance from the BCM side. Check for proper ground at the BCM.
6
Step 6: Clear the code, cycle the rear right door open and closed multiple times, and verify the code does not return. Monitor BCM live data for proper door ajar switch status changes.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a circuit malfunction in the rear right door ajar sensor or its wiring. The BCM monitors door ajar switches to determine if doors are open or closed for interior lighting, security systems, and instrument cluster warnings. A circuit fail...
The most common cause of B1335 (Door Ajar RR Circuit Failure) is: Faulty or misaligned rear right door ajar switch/sensor in door latch assembly
Typical repair costs for B1335 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. This code will not affect vehicle operation or safety, but may cause interior lights to remain on draining the battery, false door ajar warnings on the instrument cluster, and potential security system issues. Repair at earliest convenience to prevent battery drain.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1335 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Convenience Systems
Difficulty
Type
Manufacturer
Recommended Tools
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