Shut the door!
The reason why the door ajar light stays on in a 1999 Nissan Altima could be due to the door switch being stuck. It is stated to spray WD-40 into the latch and that should fix the problem.
The door ajar switch is part of the latch inside the door.
some how the tail light wire is touching the ajar wire
On my 2002 sportage 2-door, the door ajar light stays on when the tailgate is not locked. with the key.
If the trunk lid isn't actually ajar, the switch has gone out of alignment, or it broke.
The back hatch may be ajar.
Fix a "door ajar" on Chevy Impala 2003 . Still on doors closed.
Possible faulty door switch.Try contact cleaner or light grade of lubricant on the switch. Push it i nby hand and see if door ajar light goes out.
The trunk lid is open or the ajar switch has malfunctioned.The trunk lid is open or the ajar switch has malfunctioned.
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.
It's not a question !
If the door is ajar and light stays on, spray some WD40 into the latch. The door switch is probably stuck. Spray all doors then open and close a few times.