Message says "door ajar" but no door open

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Found that fuse for interior lamps. It's located in the smart junction box.

unhook your battery for 5 mins then hook it back up go to each door and open and close one at a time that way you know which door is having the problem once you find that out replace the door switch and problem fixed or just dont open that door.

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

If only the door ajar light and interior light is not working it is probably the door ajar switch located on the door latch inside the door. sometimes a little WD40 sprayed towards lower side of the latch will work, frees the piston in the switch. if not the switch must be replaced. If also the outside mirror control does not work, the door lock switch also does not work, it is a bad ground to those three systems, the Electric windows have a separate ground wire and still work. You must feed a new black wire from a good ground on the body thru the door accordion tube and connect it to the larger black wire on the plug that goes to the door lock switch. The door lock, the mirror control, the door ajar light, and the interior light problem will be gone.

Interior Lights Circuit Description
By using a feature called inadvertent power control, the body control module (BCM) supplies power to all of the following components:
• The courtesy lamps
• The dome lamps
• The rear view mirror reading lamps
• The instrument panel compartment lamp
• The rear compartment lamp
The left front door ajar switch turns the interior lamps on through the BCM by grounding CKT 394. When the left front door is open, the switch is closed. This condition provides a ground and a door open input to the BCM. The BCM then grounds the following lamps through CKT 156 in order to turn the lamps on:
• The courtesy lamps
• The dome lamp
• The rearview mirror lamps
The right front door ajar switch and the rear door ajar switches turn the interior lamps on by grounding CKT 395 from the BCM.
When the ignition key is removed from the lock cylinder, the interior lamps remain on for approximately 40 seconds.
The BCM provides an interior lamps-on delay after a door is opened. The lamps remain on for approximately 40 seconds or until the ignition switch is turned to the ON position. The 40 second lamps-on delay reduces to 4 seconds if a door is opened within 2 minutes of the ignition switch being moved from the ON position. The interior lamps immediately turn off when the vehicle begins to move.
The dome lamp OFF-DOOR-ON switch controls the dome lamp. When the switch is in the OFF position, the dome lamp remains off. When the switch is in the DOOR position, the dome lamp lights when a door is opened by the BCM grounding CKT 156. When the switch is in the ON position, ground is supplied through CKT 750. The rear view mirror reading lamps are controlled by the rear view mirror reading lamps switch or through CKT 156 from the BCM.
Voltage is supplied at all times to the BCM through the INT LPS fuse. The BCM supplies voltage to the interior lamps through CKT 1732.

Battery Run Down Protection
When the ignition switch is in the OFF position, the BCM turns off the power to all of the interior lamps after 18-22 minutes.
The BCM will reset the inadvertent power control relay output when one of the following actions is performed:
• Open or close a door.
• Turn the ignition switch to the ON position.
• Turn off any interior lamps that may be on.
• Press the power door lock switch/keyfob button.
• Press the decklid release keyfob button.

Courtesy or Dome Lamps Always On
Step
Action
Yes
No
1
Did you perform the Lighting Systems Diagnostic System Check?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Lighting Systems
2
Use the Scan Tool in order to command the courtesy lamps OFF.
Do the courtesy lamps turn OFF?
YES - Go to Step 4
NO - Go to Step 3
3
Test for a short to ground in the courtesy lamps control circuit (156). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - System OK
NO - Go to Step 7
4
Test for a short to ground in each door jamb switch circuit:
• Circuit 394-Driver door
• Circuit 395-Passenger door(s).
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - System OK
NO - Go to Step 5
5
Test each door jamb switch for proper operation. Refer to the following:
• Open switch with the door closed
• Closed switch with the door open
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find a malfunctioning door jamb switch?
YES - Go to Step 6
NO - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
6
Replace the malfunctioning door jamb switch. Refer to Door Jamb Switch Replacement in Doors.
YES - Is the repair complete?
NO - System OK
--
7
Important: Perform the set up procedure for the body control module.
Refer to Body Control Module (BCM) Programming/RPO Configuration .
Replace the body control module. Refer to Body Control Module Replacement in Body Control System.
Did you complete the replacement?
System OK
Instal the door jamb switch wire harness.
Install the door jamb switch (2).

there is a timer on the interior lights to turn off after 20 minutes.
one of your door switches are bad,and it tells the computer that a door is open and the lights are turned off,that makes sense.
a way to test this is to undo the battery for a minute. then see if the interior lights come on. one of the door switches is bad

I have this same problem. A mechanic friend told me that basically the grease they use to grease the door latches cause a sensor to think the door is open. He said to buy something thtat will break up this stuck grease, but also has lubricating effects. I forgot what he told me to buy though.

Spray some WD40 into the latches on the side of the doors then open and close the doors several times firmly.This will unstick the door adjar switch most of the time.Start with drivers door first.

you have either the thumb wheel switch beside the headlamp switch is turned all the way up or a sticking door ajar switch.
Does the door ajar light in instrument cluster stay on?
If so then you can shoot some WD-40 into the latches on the side of the doors then open and close them firmly a few times and this will usually unstick them.

I had this problem on my 2003 explorer and took WD40 and gave the lock mechanism a good dose where it meets the clasp on the door jam. Then open and close the doors a couple of times to get them working. They get gummed up and sometimes have a tendency to stick.