Place and connect the speaker first, then mount it with the fasteners and attach the front door trim panel and finally connect the negative battery cable. For the speaker in the instrument panel, install it, link the electrical connector, mount the speaker with fasteners, lay the speaker cover over it and attach the negative battery cable to the ground. The process for installing the center speaker at the instrument panel is the same; position the speaker, link the electrical connector, fit and fasten the mounts, apply the speaker cover and attach the negative battery cable. To complete the rear speaker, position it, screw in the electrical connector, mount the speaker using the screws, install the rear shelf trim, connect the quarter panels and finally connect the negative battery cable. First, fit the subwoofer into the place on the rear shelf, then join the electrical connector, fix the fasteners, fit the back trim after the rear shelf, attach the quarter panels and connect the negative battery cable. For the trunk-mounted subwoofer, first put the subwoofer into the vehicle, attach the electrical connector, secure the top fastener on the subwoofer, secure the negative end of a battery cable and close the decklid. Whenever the battery has been unplugged, you should always do a battery reconnect procedure.