Hi, a friend of mine has a 2000 Buick Century, When you hit the unlock button on the driver door, or any door for that matter, or the keyless remote, the doors will unlock, but if you hit lock on the doors or the remote the drivers door locks, but the rest of the doors will not lock, they can only be manually locked for some reason, should I just tell him to take it to a dealer? Or does someone have an idea of whats going? I think they are getting power beacause you can hear the actuators...but they arent fully functioning obviously....