- Defective door ajar switch. The door ajar switch is a small, mechanical switch that is located in the door frame. When the door is closed, the switch is depressed and the circuit is completed, allowing the door ajar light to turn off. When the door is open, the switch is released and the circuit is broken, causing the door ajar light to turn on. If the door ajar switch is defective, it may not be able to properly sense when the door is closed, causing the door ajar light to stay on even when the door is closed.
- Damaged wiring. The wiring that connects the door ajar switch to the door ajar light may be damaged, preventing the switch from sending a signal to the light.
- Faulty door ajar light bulb. The door ajar light bulb may be faulty, causing the light to stay on even when the switch is functioning properly.
- Defective door lock actuator. The door lock actuator is a small, electric motor that controls the door locks. If the door lock actuator is defective, it may not be able to properly lock the door, which may cause the door ajar light to stay on.
