They are supposed to lock when you put the car in drive. To change the lock actuators, you need to take the door panel off. Start by taking the trim around the seat control off, then take the screws behind the trim out. Unplug the seat control harness. Then, take the speaker cover off, and take the screw behind that out. Then, carefully work your way around the door popping the clips out. When you take the door panel off, unplug the light in the door. The lock actuator is toward the back end of the door. Unplug it and unhook it from the linkage. There are 2 rubbers on each side of the actuator holding it in the frame of the door. Push on it and it should slide out of the housing. Repeat in reverse order! I think thats everything