Disconnect the cable from the negative battery terminal. For the Radio/Navigation unit on Camry and Lexus models, pry out the center register above the radio using a trim tool. On Avalon models, remove the center trim panel. On Camry models, pry off the side center trim panels. Remove the retaining fasteners and pull the radio/navigation unit outward to access the backside, then disconnect the electrical connectors and the antenna lead. Remove the upper mounting fasteners and the lower mounting fasteners and pull the audio/navigation unit outwards. Remove the mounting bracket fasteners and brackets, then separate the radio/navigation unit from the heater and A/C control panel assembly. Separate the radio unit from the navigation unit. Installation is the reverse of removal. For the Door speakers, remove the door rim panel. Remove the mounting fasteners and pull the speaker out of the door. Disconnect the electrical connector and remove the speaker from the vehicle. Installation is the reverse of removal. For the Instrument panel speakers, carefully pry the speaker covers out using a trim tool. Remove the mounting fasteners and pull the speaker up. Disconnect the electrical connector and remove the speaker from the instrument panel. Installation is the reverse of removal. For the Rear package shelf speakers, remove the rear seats. Remove the rear package shelf. Remove the mounting fasteners and pull the speaker up. Disconnect the electrical connector and remove the speaker from the shelf. Installation is the reverse of removal.