Where can you find a diagram for the door ajar warning light to repair it when it stays on for no reason?
Check if the fuse for your interior lights isn't blown. On many
cars the Door Ajar light will come on when there's no power to the
interior lights. The dashlight then grounds itself through the
interior lights. It depends on the car made. for example Taurus,
just lubricate(real good) the lock with wd40, will take care of the
problem. some cars have sensors will lock automatically when you
close door then will LOCK automatically. if one of the locks is
jamed the ajar warning come on. Easiest way lubricate all doors
lock you will fine. Good luck