Question about 2003 Ford F150 Regular Cab

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I have a 2003 F150 Supercrew. The door ajar light began staying on some times in the past week. Then tonight the interior dome lights and exterior lights over the bed of the truck also are staying on, even tho every door is slammed shut and the truck is locked.

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  • Anonymous Mar 13, 2014

    the door ajar warning light and the interior lights stay on all the time regardless if i get out and slam shut all the doors and do an exterior visual search on the doors

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The interior lamp relay is at fault
replace it soon to save the battery

Posted on Jul 29, 2010

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Try spraying the door latch liberally with WD-40 and closing and opening it a few times. It is not uncommon for the door latch switch to get gummed up, and not show a closed door. You might have to spray and close / open a few times to get the contacts cleaned out enough to work again.

Posted on Aug 14, 2010

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You have a bad switch in a door latch. allow the truck to sit ( unlocked ) untill the lights go out and then starting with the passenger side rear door open and close each door ( again waiting for the lights to time out ) The one that does not turn the lamps on is the bad switch... They are cheap from the dealer but quite a pain to install ..

Posted on Jul 29, 2010

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1 Answer

Interior lights stay on and panel says door ajar


its gonna be your door ajar switches,they are located inside your doors on the latch assemblies themselves,they are cheap enough so i would suggest replacing both at the same time,hope this helps

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Is the door ajar light in the cluster illuminated ?

Could be the door ajar switch ( part of the door latch ) is gummed up, and needs to be WD-40 sprayed into it, and close open the doors a few times, and repeat.

The autolock uses the same input, to know to lock the doors when you press the brake pedal while moving.

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You need to remove the door ajar sensors from the doors and clean and lube them. You must remove the interior door panel then remove the door latch. Then twist the switch out of the latch to work on it.

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My door ajar light stays on sometimes while driving along with my interior dome light on my 1997 Ford F-150. Also, the door ajar alarm will go off for a certain amount of time after i get out of my truck.


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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.

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Lube your door latches. One of the door ajar switches are sticking . Use wd40 or some othe spray lube . Spray into the latch and open and close doors several time.

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2 Answers

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This is the problem with door switch on the car , you need to change the door switch in the car..


Good luck...

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