Is door ajar light on also?
On my 2002 sportage 2-door, the door ajar light stays on when the tailgate is not locked. with the key.
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.
change blown fuse for interior light,fuse is found on the inside drivers side kick panel....
bad door ajar switch inside one of the doors its in the striker assy
check the sensor on the door, its probably bad
Try spraying WD-40 on the door latch, the part that is on the door itself. The door ajar switch is located in with the latch. Had the same problem, door ajar light on, interior light stays on, and horns toots twice when you lock with remote, to signal door is not closed. Door was shut but truck didn't know it, WD40 fixed it.
Because one of your door sensors are broken.
you need to check your fuses first ( sounds like it) they are on underdash (drivers side)
Close it hard
Just spray some wd40 in all the latches. The sensors are in those latches. I had the same problem and it solved it for me
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.