You need to position the rear door
Window Regulator into the rear door, connect the rear door window regulator motor electrical connector, position the rear door window regulator motor inside the rear door and install it into the key slots in the inner door panel and the rear door window regulator rail assembly inside the rear door and install it into the key slots in the inner door panel, install the rear door window regulator rail lower mounting screws, hand tighten the remaining rear door window regulator screws and install the rear door window and the rear door water deflector.