At TransMASTER.biz We specialize in correcting or replacing the door lock actuator in your BMW. The power door lock actuator is a simple mechanical device. A small electric motor turns a series of spur gears that serve as a gear reduction. The last gear drives a rack and pinion gear set that is connected to the actuator rod. The rack converts the rotation motion of the motor into the linear motion needed to move the lock. When these components wear down or break, Don't worry, we have the experts that can get in and get the problem corrected by repairing or replacing what is necessary to get it working again. Our team is highly trained in the electronics of BMWs and can get the job done quickly and at a price you can afford.