B1489: Right Front Door Latch Circuit Short to Battery
The body control module (BCM) or driver door module (DDM) has detected a short to battery voltage (B+) in the signal circuit of the right front door latch or door ajar switch. This fault prevents the system from accurately determining whether the door is open or closed, affecting interior lighting, central locking, and the alarm system.
1. Commonly Affected Makes
2. Most Common Causes
- Chafed or pinched wiring in the right front door latch circuit contacting a B+ line
- Internally shorted right front door latch switch (door ajar switch)
- Corrosion or moisture bridging pins in the door latch connector or BCM connector
- Internal failure of the BCM or driver door module (DDM)
3. Symptoms You Will Notice
- Interior lights stay on or do not work properly
- Central locking system malfunctions (doors may not lock/unlock correctly)
- Alarm system false triggers or fails to arm
- Door ajar warning light on the dash may be illuminated or erratic
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to door latch or BCM issues for the specific vehicle.
Visually inspect the wiring harness between the right front door and body for chafing, pinching, or signs of shorting to B+.
Test the right front door latch switch for a short to battery voltage using a multimeter; compare readings to manufacturer specifications.
Inspect the door latch connector and BCM connector for corrosion, bent pins, or moisture intrusion.
If wiring and switch test OK, suspect a faulty BCM or DDM; perform module self-test or swap with known-good module if possible.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but you may experience issues with interior lights, door locks, and the alarm. The door itself will remain closed and latched. However, if the door ajar warning is false, the dome light may drain the battery over time.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on the cause. A simple wiring repair may cost $100–$200, while replacing a door latch assembly or BCM can run $200–$400 or more, including labor.