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.
One of the door latch switches is bad. Usually the drivers, but not always. You will need to replace the switch, the dealer will have a lot in stock.
Testimonial: "HOW DO I PUT THE SWITCH IN"
SOURCE: 95 ford windstar door ajar
These switches are inside the doors attached to the door latch assembles.If you know some one with a scan tool you can go into the body computer and see which one is showing open when all the doors are closed. The most likly one is the drivers side door or the two in the rear gate. I've replaced those the most.If you don't want to replace them you can unplug them and the lights will go off. Hope this helps. If you need more info let me know> Thanks Dan
SOURCE: 2003 Explorer door ajar light stay on when all doors are closed
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.
SOURCE: 2003 ford expedition "door ajar" & interior lights staying on
I had the same problem with my 2003 F-150. To fix the problem I spayed WD-40 into each door latch, problem resolved!!!
SOURCE: Door Ajar light stays on on the dashboard which
try spraying WD40 into the latches and open and close the doors a bunch of times
SOURCE: door ajar light stays on
just spray the door latches with lubricant be sure the oil penetrates the internal machanism.
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