The interior door handle can be removed by initially removing the door inner trim panel and then using an appropriate screwdriver to loosen the lower holding clip of the handle, sliding it out of the door and out of the connector rod. In the case of the exterior door handle, this may be accomplished with the inside trim panel still attached; in the case of the front door, with the handle of the lock inserted, loosen the handle retaining bolt at the back of the edge and pivot the whole handle assembly out of position even as the key is rotated 90 degrees to unlock it in the lock operating lever. Get back the handle seals and lock retaining clip, checking it not to be damaged, replacing it accordingly, but do not drop the clip in the door. Then take out the exterior door handle, unhook the connecting rod on the back of the lock cylinder and get the spring back, then disengage the coupling and spring on the back of the cylinder and the lock cylinder out of the handle, as well as replace and repair a damaged sealing ring. With the front door lock, the window should be completely closed, then the interior door handle should be removed, the door trim panel which is holding the clips should be levered out and the insulating panel should be peeled to have access to the lock assembly. Deassemble the exterior door handle, the vacuum line and wiring connector(s) in case of central locking, loosen and remove the lock retaining bolts, disengaging the lock to the link rod. In the case of the rear door lock, the central locking element wiring connector is disconnected; the retaining pin of the interior lock button pivot link rod is pressed out; the link rods guide clips are unclipped and the lock retaining bolts are loosened and removed to maneuver the lock and the link rod out of the door, being careful not to exchange the link rods. To install it, you will need to insert the interior handle into the link rod and you will need to snap the handle back in place making sure that it works properly, before putting the panel of the trim back into place. In the exterior handle, then put the lock retaining clip in place and insert the seals, connect the lock front pivot, clip the handle rear and ensure its functionality before securing and tightening the retaining bolt. Apply lubrication to the lock cylinder and locking plates, place the sealing ring, then fit the cylinder, then fit the coupling and spring, making sure they are properly positioned then check that it is working. In the case of front door lock, loosen the lock adjusting screw, put the lock into place, attach and screw the retaining bolts, reconnect the vacuum lines and wiring connector when needed and put the exterior handle. Use the access of rubber plug to adjust the lock, make sure the lock and handle properly adjusted, and verify the work of the lock and handle, installing the insulating panel and trim panel again. When fitting the rear door lock, install the link rods in the right way, loosen the lock adjustment screw, position the lock assembly into place, loosen the retaining bolts, reconnect the vacuum lines and wiring connector where needed, attach the link rod to the pivot and fix it with the retaining pin, and the installation is complete.