* Faulty door switch: The door switch is responsible for detecting when the door is open and sending a signal to the vehicle's electrical system. If the door switch is faulty, it may remain in the "open" position even when the door is closed, causing the door ajar light and interior light to stay on.
* Problem with the wiring: The wiring between the door switch and the vehicle's electrical system may be loose, damaged, or corroded, preventing the signal from the door switch from reaching the electrical system. This can cause the door ajar light and interior light to stay on.
* Defective door ajar module: The door ajar module is responsible for controlling the door ajar light and interior light. If the module is defective, it may malfunction and cause the door ajar light and interior light to stay on even when the doors are closed.
2000 Ford Explorer Sport
* Faulty door switch: Similar to the F-150, the door switch in the Explorer Sport can also become faulty and remain in the "open" position even when the door is closed. This can cause the door ajar light and interior light to stay on.
* Problem with the wiring: Again, loose, damaged, or corroded wiring between the door switch and the vehicle's electrical system can prevent the signal from the door switch from reaching the electrical system, causing the door ajar light and interior light to stay on.
* Defective Body Control Module: The Body Control Module (BCM) in the Explorer Sport is responsible for controlling various electrical components, including the door ajar light and interior light. If the BCM is defective, it may malfunction and cause the door ajar light and interior light to stay on even when the doors are closed.
Please note that these are some of the common causes, but to accurately diagnose the issue and determine the best solution, it is recommended to have your vehicle inspected by a qualified mechanic.
