I have a similar problem with my passenger door and the rear door, driver's side. What I am planning to do is taking the paneling off and looking at the entire system. Look for anything that seems out of place. Mine works at times at doesn't at other times. In the future, try to ensure that most of your locking and unlocking is done using the button in your center console. That way the mechanism applies only the amount of force necessary to lock and unlock the door, as opossed as what is bound to happen when us humans do it -- we can often apply to much force and mess up the mechanism as a result. Good luck. I'll make sure to post pictures and a short testimonial after I fix mine. Please do the same if you get it done before I do.