all of my locks work except for one of the backseat passenger door locks. It always has a delay and I have to press the lock/unlock button three times. I've tried locking it manually, just with the key, and I still have the same problem. Is there something wrong with that particular door or what?

 

If it makes a noise the actuator is going bad.

 

thx for replying back, but what is an actuator & does it need to be fixed/replaced?

 

bump i have the same problem, driver side, how hard is replacing it oneself?