Door ajar dash light staying on

The switch that turns the interior lights on when you open the door also controls the door ajar sound and light on dash board now that switch
Is either in the door hing or it's a pin switch that sticks out of the pillar post that switch is going bad you have to locate it and replace it hope this helped

It can be issue with faulty sensor or a wiring issue.Troubleshooting is required.
Click the help link shown below:---
Door Ajar Light and Dome Light Remains ON? http://whoisbyme.blogspot.in/2012/06/2003-mercury-sable-door-ajar-light-and.html
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Door ajar light stays on? http://technoanswers.blogspot.com/2012/01/door-ajar-light-stays-on.html

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Thanks.

locate the door thats doing it,, and check the plunger switch in the door thats creating the problem,, it may be just getting stuck,, replace if necessary

Try replacing the door jam switch

very common check inthe door jam and see if the leaver which is usually black moves freely may have a wire disconnected from that

the switches for these vehicles are in the latch and they seize up from time to time. you will have to spray some penetrating oil into the dor and rapidly close and open the door hard to try and fix it. if that doesn't work then you will have to figure out which door it is and replace to latch. note if key is on, the dash will make a tone everytime you open and close door. so the door that doesn't chime that is the door with the issue.

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.

Do you get a "Door Ajar" warning? If so that is keeping the light on. On my 03 Mountaineer, the rear hatch emblem has a crack around it that allowed the door sensor to think the door was open.

go to your local parts store and buy a can of PB BLASTER lubricant then open each door and spray the latch assembley really good then close and open the door 10 to 15 times. do this with each door. the door ajar light switch is located in the door latch assembley and cannot be seen so soak the latch assembleys really good so lube reaches the switch. these switches sometimes get stuck but this usually frees up the switch

Ends up being a broken wire(ground) in the rubber boot between door and frame. I carefullly removed door panel, pinched the ends of the boot and slid it back into door. And there it was...a broken black wire. Spliced in a new piece of wire, reassembled everything else. Everything works like it should. It's really not that hard just take your time. Also before I started I disconnected the battery as a precaution. Goodluck.