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Principles of Operation
Interior Lighting
The interior lighting is broken down into two groups: the courtesy lamps and the illuminated entry lamps. Both lighting features interact with the courtesy light arbitrator. The battery saver is also listed in this section.
Courtesy Lighting
The courtesy lamps consist of the dome lamp and/or map lights. The courtesy lamps can be activated by the GEM using the panel dimmer switch, or by any ajar door. The courtesy lamps will shut off when the doors are closed and the illuminated entry feature is not active, or when the vehicle speed is greater than 8 kph (5 mph). The interior lamps will not be reactivated until the vehicle speed is less than 5 kph (3 mph) and a new door open warning lamp switch signal is received. The inputs are:
more then likely it's a door ajar switch - not a sensor . Anti-Theft- Perimeter Alarm System
The perimeter anti-theft system provides for vehicle security through an audible and visual notification if the vehicle's exterior is invaded without the system being shut off. The system self-arms when the doors, liftgate and hood are closed and the key is OFF. Any open door, hood or liftgate will prevent the system from arming. The hood ajar switch, door ajar switches and liftgate ajar switch cause these circuits to register as normally closed circuits. The vehicle security module monitors the status of the hood ajar, door ajar and liftgate ajar switches. If these circuits indicate an open entry point, the switch opens the circuit to the vehicle security module, which energizes the horn and autolamp relays (causing the horn to sound and the lights to flash). The vehicle security module turns off the anti-theft system when it receives a command through the keyless entry keypad, remote keyless entry (RKE) transmitter, or anti-theft alarm inhibit switch.
https://www.youtube.com/watch?v=egIGBzO065U
open the door and manually press in the little switch that the door closes onto. If the door open light stays on then there is probably water got into the back of the switch or dirt ... giving a false signal to the dash light. try cleaning the switch and contacts.
There is a tiny switch inside the door called the "Door Ajar" sensor, remove the door panel and replace that switch, it is attached to the door latch, it just twists out and back in.
there is a switch in each door that senses the door is open, it is called the door ajar/courtesy light switch (imagine that), they stick and have this problem, replace it.
Often, intermittent "Door Ajar" warning is indicative of a faulty switch. The switch is normally embedded into the body and is triggered by the door pushing on a rubber cover. They are normally located at the rear edge of the door opening. A 1997 Ford Explorer would have a switch similar to the image below.
It is highly probable that the switch has some corrosion causing it to engage every now and then. Another probability is that the rubber cover has come loose causing vehicle vibration to engage the switch.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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