When repairing 2008 Armada models and all Titan cars, you need to disconnect the cable from the car's battery negative terminal first. Pull up the center bezel using a small screwdriver or trim tool. It contains the control panels for the radio and A/C heating system. Unplug the electrical wires, pull off the center facility with the radio controls as one piece, then remove all screws that hold the radio control to the center bezel. After that, unscrew the radio holder from its place atop the dash, then gently pull out the radio unit. Before taking it out, unplug the antenna lead and remove electrical wiring connected to it. Use a little screwdriver or trim tool to kick open the instrument panel cover at the front. Unbolt the tweeter, take it out, and disconnect its wire connection. Unplug the electric link, undo all screws, then pull the speaker out from its housing beneath the center speaker cover. To remove a door speaker, pull off the door trim panel, loosen the screws keeping the speaker in place, disconnect the electrical wiring, and take the speaker out. To get the liftgate speakers out, first remove the liftgate trim panel. Second, unscrew the speaker brackets and disconnect the electrical cord before taking out the speakers. Last, to take out the sub-woofer from truck cabs with upgraded sound systems, put either side of the front seat in the rest position, disconnect the speaker cables, and undo the speaker's holding bolts before lifting it free. We follow the same steps for installation that we used when taking components apart.