After plugging in the wire harness, slide the speaker into the retainer, install the quarter panel trim on the right side next, fit the rear upper seat belt bolt, attach the scuff plate on the liftgate and put in the trim on the rear headrest before attaching the battery's negative cable. To set up the speaker at the front door, attach the wire harness, set the speaker into the door, hold it tight with the screws and install the front door trim panel before the negative cable. Put the wire harness and speaker into the instrument panel, both using the panel's screws, add the pad on the top of the panel and side A trim piece and only then connect the battery negative terminal. For this quarter panel speaker, hook up the wire harness first, then place it against the trim panel and secure it with the screws, install the quarter trim bolster next and finally connect the battery negative cable to it.