1997 Nissan truck door driver side with power door locks will not unlock from outside with key any more Do you know what is wrong?

Answer 1

start by opening another door so you do not get locked out by accident.... ok. 1. open the door in question from the out side with interior manual lock open now same with interior lock locked. 2. use the power door lock button and unlock the door then open from inside and out side the door now same power door lock and open door from both inside and out side the car. you now know the locking mechanism is working... lets check the lock.... 3. take your key and put it in the other door and just turn it in either direction. if the key in the lock cylinder turns to the 3 oclock and 9 oclock position in that door you know the key is good.. take that key to the door in question and do the same thing. if the key turns about the same distance then the lock is working. but is it connected. now... go to the other door and feel the tension when you turn the key. you will feel a bit of movement then you are turning a bar. immediately go to the door in question and do it again if you do not feel the same tension the bar connecting the manual key lock to the locking bar mechanism has probably disconnected. not to work this entire exercise is about 2 minutes. good luck