The door ajar light is staying on and causing the interior light and the running board lights to stay on. There is no door open

Is your 'door ajar' or 'dome light' staying on? Forum members suggest various methods that they fixed their issue. The methods include:

• Adjusting the dimmer

• Spraying the switch with a lubricant

• Replacing the switch

• Replacing the relay

This is usually caused by the door ajar switch not making contact.
The door switch is part of the door latch on the F-150.

Liberally spray the door latch with WD-40, close and open a few times. Repeat this process 3 or 4 times, and check the interior lights / door ajar indicator on the cluster.

There are pictures of where to spray in a sticky in the Electrical forum on F150online.com if you need them. This is a somewhat common problem, to get dirt and gunk in the door ajar switch, causing the contacts to stay open.

you have to take out the door ajar switch its in the door it works your interior lights and door ajar switch which is in the door and is hitched to the door latch

Sounds like one of the door triggers has continuity to earth,(Shorted) Test them all with a multi meter.

Cheers CeeBee

You have a door ajar switch sticking in one of the doors. Start with the drivers door,open door and spray a liberal amount of WD40 into the latch on the side of the door. Then open and close the doors firmly several times. This usually unsticks them.

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.

The door switch is stuck on or the wire is shorted to ground.

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


Good luck...

The switch that tells the computer that the door is closed is broken or has a loose wire.This causes the computer to think the door is open thus the door ajar and interior light on.Switch should be located on door jam.

Our Ford Expedition & an Olds Silhouette Premier & both did the same thing. Someone online said to spray the inside door where the metal connects with the frame & sensors are there with WD-40. We did & it fixed the problem. Maybe this will work for yours.