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If the lights are on and the door is ajar it will make a steady alarm.
Each door has an ajar sensor. Disconnect it and see if it works. If it does not work, just unplug the ajar alarm, which is a small black box, from the panel to disable it.
You have to take it to a shop to have the computer resetAnswerMost likely it's either the door ajar alarm or the seatbelt alarm.
why does my door ajar alarm keep coming on and off while driving my car.
I've had that happen in my 2002 mountaineer. what I've found is that if you spray the door latches with wd40 it will clean off the sensors and the door ajar light should go out. but make sure all the doors are shut.
Try shutting the door.
make sure ALL the doors are closed
spray your door latches with wd40.
this problem is related to the door ajar switch which is connected to the latch. spray wd-40 into the latch and it should go away.
They are built inside the latches.
Check the door sensors that a common source of false door ajar warnings/signals. See "Related Questions" below for much more about fixing this problem.
Inside the door under the latch.