B2473: Passenger Door Disarm Switch Circuit Low
Diagnostic trouble code B2473 indicates that the Body Control Module (BCM) or passenger door module has detected a permanently low voltage signal (short to ground) in the passenger door disarm switch circuit. This switch, typically located in the door lock cylinder or interior handle, sends a ground signal to the BCM to disarm the anti-theft alarm when the door is unlocked with a key. A short to ground causes the BCM to interpret a constant disarm request or a circuit fault, disabling the alarm function for that door.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty passenger door disarm switch (lock cylinder/handle) with internal short
- Chafed or pinched wiring in the switch signal circuit shorting to body ground
- Damaged door harness connector (rubber boot) with moisture or corrosion bridging to ground
- Faulty BCM or door module (DDM/PDM) with internal input driver failure
3. Symptoms You Will Notice
- Anti-theft alarm does not disarm when unlocking passenger door with key
- False alarm triggers or alarm remains active despite unlocking passenger door
4. Step-by-Step Diagnosis
Scan for related codes and verify B2473 is current
Inspect passenger door disarm switch and wiring for damage, corrosion, or shorts to ground
Test switch operation with multimeter: should show open circuit when not pressed, ground when activated
Check door harness connector for bent pins, moisture, or corrosion
If wiring and switch are good, suspect BCM or door module fault
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle remains drivable. However, the anti-theft alarm may not function properly on the passenger side, which could lead to false alarms or reduced security. It is recommended to diagnose and repair the issue soon.
How much does it cost to fix?▼
Repair costs typically range from $100 to $300, depending on the cause. A faulty switch or wiring repair is usually on the lower end, while BCM replacement can be higher.