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On my 2002 sportage 2-door, the door ajar light stays on when the tailgate is not locked. with the key.
The bulb could be blown.
some how the tail light wire is touching the ajar wire
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.
a door in your car is not fully shut.
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.
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.
The door being open.
Sounds like one of the door switches or wire running to them is shorted to ground, since the indicator and cab light are looking for a ground to come on. Some vehicles will not allow power door locks to work while doors are ajar.
the door ajar light is staying on all the time
you may have a circuit or you can check your doors for any malfunctions