First of all, one has to take out the door panel, as well as the sealing screen. Then, to remove the lock cylinder from the rod, turn the resin clip counterclockwise. Remove the nuts that lock the outer handle of the door, so that the handle could be removed. Take out the screws that secure the interior door handle and the door lock and take out the door lock mechanism from inside the door. To do this remove the retaining clip and pull out the lock cylinder. Next to install the lock cylinder and the clip back into the door step. Subsequently fit the door lock assembly and the handles. Last of all and very important, screw the door panel with other components that belongs to it.