mercedes benz vito lock central lock - forum about car MERCEDES BENZ CLASS V 6382 2003 Vito w638 Central locking problem Hi There My central locking on the first press of the button locks then opens on the second press locksopens and then finally locks Ive been told by a MB dealer its the sensor in the drivers door lock. Installing central locking | How a Car Works Installing central locking locks. The Video Course Central locking wiring diagram. Each drive unit has a small length of wiring attached to it which terminates in a multi-plug. The master drive unit is identified by having two extra wires connected to it. These are the feed and earth return for the entire door lock system.