Door Ajar Lamp Circuit Short to Battery
The body control module (BCM/GEM) has detected a short to battery voltage in the door ajar indicator lamp circuit. This means the wiring supplying the dashboard warning light is making unwanted contact with a constant 12V source, preventing the module from properly controlling the lamp.
1. Commonly Affected Makes
2. Most Common Causes
- Wiring in the door ajar lamp circuit shorted to battery voltage (e.g., chafed wire contacting a power wire)
- Faulty body control module (BCM/GEM) with an internally shorted driver
- Faulty instrument cluster (IPC)
- Corroded or bent connector pins bridging power circuits with the lamp circuit
3. Symptoms You Will Notice
- Door ajar warning light stays on continuously or fails to illuminate
- Chime or warning system may behave erratically
4. Step-by-Step Diagnosis
Check for battery voltage on the door ajar lamp circuit with the ignition on and door closed
Inspect wiring harness for chafing or damage near the door hinge area
Test BCM/GEM output to the lamp circuit using a scan tool
Inspect connectors for corrosion or bent pins
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the door ajar warning may be inaccurate. Have it diagnosed soon to avoid battery drain or other electrical issues.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether it's a wiring repair or module replacement.