Why do the interior lights remain on when door is shut and door ajar warning is on for the driver's door?

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:

• ignition switch position

• driver door ajar switch

• front passenger door ajar switch

• rear left door ajar switch

• rear right door ajar switch

• vehicle speed switch (VSS)

The outputs are:

• battery saver relay

• interior lamp relay

courtesy light switch , is door ajar switch an it's part of the door lock actuator . Light on coming on ? Not going off ? The ajar switch is a input to the GEM module , fords BCM - body control module . The GEM will energize a relay to turn on the lights .
The GEM will illuminate the interior lamps when any door is open or ajar. The interior lamps are; the dome lamp, the rear cargo lamp, the door courtesy lamp and the side rail lamps. 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 5 mph (8 km/h). The interior lamps will not be reactivated until the vehicle speed is less than 3 mph (5 km/h) and a new door open warning lamp switch is received.
The GEM controls the interior lamps illuminated entry function by activating the interior lamp relay.
Mite be a good idea to have it check for DTC'S - diagnostic trouble codes .

B1322 Driver Door Ajar Circuit Short to Ground GEM GO to Pinpoint Test B . B1323 Door Ajar Lamp Circuit Failure GEM REFER to Section 413-01 . B1325 Door Ajar Lamp Circuit Short to Battery GEM REFER to Section 413-01 . B1330 Passenger Door Ajar Circuit Short to Ground GEM REFER to Section 417-02 . B1334 Decklid Ajar Rear Door Circuit Short to Ground GEM GO to Pinpoint Test C . B1338 Door Ajar RR Circuit Short to Ground

This can be caused by a door or trunk being ajar, be sure you shut all doors firmly, if there is still no resolve check by shutting all doors then open one up and press the button (if any) on the inside of the door jam and see if it is broken or the light goes off.

that sounds like the door latch assembly is faulty it does not use the same micro switch for door open signal has the interior light

Try spraying wd40 into each door latch. Do it one at a time then open and close the door about a dozen times spray some more in there after about 6 open and closes. Do this with each door and even the hatch. This should clear ya right up.

Either a faulty door switch or the module will cause this. Not quite sure where the module is in your vehicle but all of them have one.

Pull Fuse #31 in your driver side under dash fuse panel. Bottom means closest to the floor. Second row from bottom. Second fuse in from driver side door 15A. Controls all interior lighting and courtesy lights. Under hood and trunk.
Pull it and your good to go until you drop off to have the control module replaced. You're Welcome!

I suspect you have a bad door ajar switch on one of your doors.

The switch is on the door latch. try pushing each door in with your hand one at a time and see if the warning goes away.
The Lighting control module is $500 and controls a lot of the vehicle functions. It is part of the headlamp switch. It has to be configured by the dealer with his NGS tester before it will work. Ebay has them cheap sometimes. Only buy Continental LCM for your model year.



info
When at least one door is ajar and the key is in the RUN position, the door ajar cluster lamp is activated and remains on until all doors are closed. A warning tone will sound once any time the key is in the ignition switch and any door is open.
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Visual Inspection Chart Mechanical Electrical

• Door ajar switches.

• Fuse junction panel fuse 28 (10A), 4 (10A), 5 (10A).
• Power distribution box fuse 6 (60A).
• Circuitry.
• Damaged or corroded connectors.
• Lighting control module (LCM)
• Driver door module (DDM).
• Virtual image cluster (VIC).
• Restraint control module (RCM).
• Low tire pressure module.

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• The Door Ajar Chime Does Not Operate Properly

• LCM.
• Driver door ajar switch.
• Passenger door ajar switches.
• Key warning switch.
• Circuitry.

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remove the door trim panel to access the door ajar switch.


Remove the door open warning switch by turning it counterclockwise.
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Trim Panel —Front Door Removal

1. Remove the screw cover.

1. Remove the screws.

1. Remove the front door trim panel (23942) from the door.

1. Disconnect the electrical connectors and remove the front door trim panel.

Installation

1. Follow the removal procedure in reverse order.

Removing a relay can cause all kinds of problems. The door ajar switch may have just need to be sprayed with a lubricant to unstick it so the lights would go off.reinstall relay to see if concers goes away.

Is it an old van? Can you see on the door frame a switch does it come out when the door is opened (push in and out a few times). 3 position switch on always / off always and door switch?