Basically, although all other doors are shut, there is still a small draft which is coming in through the closed door, causing another to open slightly.
The door ajar light might stay on in a Mercury Mountaineer if a door is not shut properly. Sometimes a door will seem like it is shut, but will not be shut enough to trip the light off. Check for dirt or other debris in the door latch for all doors.
The "Door Ajar" warning means your door is not shut all the way.
The system thinks that a door is not shut completely. If all of the doors are shut tight, then a door switch is loose or bad.
If the door ajar light is coming on in your gauge cluster, and the warning chime is sounding when all your doors, liftgate, and glass hatch are securely shut you most likely have a sticking door ajar switch. The door ajar switches are inside the doors mounted on the latch mechanisms.
That usually means that one of the doors is not shut all the way or there is a misadjusted door ajar switch.
spray wd40 in all the latches then open and shut all the doors a couple of times
bad door ajar switch inside one of the doors its in the striker assy
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.
The door ajar light remains on when one or more doors in a vehicle are not fully closed or when the door switch, which detects the door's position, is malfunctioning. It can also be triggered by debris or a faulty sensor. If the light persists even after ensuring all doors are securely shut, it may indicate an electrical issue that requires further investigation.
This warning shows up on the on the dash and means one of the doors is not shut all the way. Most commonly shows up if the back tailgate is not slammed shut.
The back hatch may be ajar.
the door ajar light is staying on all the time