How to remove the rear door lock assembly on a Mercedes-Benz S320?
2 Answers
Pry open the small cover at the handle area, and you will find a screw inside. Pry open the cover of the window regulator, and you will see the wiring connector inside. Start prying from the middle, then the top, and finally the bottom. Do not reverse the order. If you start prying from the bottom first, the lowest hook may break. There is a relatively hidden screw at the position of the window regulator. Remove it. After removing the screw, use a screwdriver to pry open the handle panel from top to bottom. Finally, remove the door lock.
Removing the rear door lock assembly on a Mercedes S320 requires a step-by-step approach. First, remove the door panel by carefully prying open the clips along the edges with a plastic trim tool, starting from the bottom. There's a T20 screw hidden inside the door handle that needs to be removed, along with two more beneath the armrest. After peeling off the door panel, pay attention to the wiring harness connectors behind it—disconnect the central control switch connector first. The lock assembly is secured to the metal frame inside the door frame, which is a bit tricky to access. Use a 10mm socket with an extension to remove the two nuts. The lock assembly is connected to the linkage and lock cylinder cable—remember to take photos of their positions before disconnecting the clips. When installing the new lock assembly, test its movement several times to ensure smooth operation; otherwise, the door closing sound may be off. Finally, reconnect the wiring harness and reinstall the door panel, but don't snap the clips back immediately—test the central locking function first before reassembling. Avoid forcing the plastic trim pieces, as the interior panels on older Mercedes models are particularly brittle.
