Q: How do you remove and install the radio and speakers on Nissan Altima?A: To remove the radio, first, loosen the wire harness connected to the negative terminal of the battery after that undo the centre vent grilles from the instrument panel. Second, the small trim panel which is located below the radio should be taken off and then the screws that holds the radio on the assembly from the top and at the bottom should also be taken off. Rotate the Radio assembly backward and pull out the electrical connectors from the radio and the Heater/Air conditioning control panel. Next, it is necessary to take out the radio: unscrew the radio bezel screws and the radio mounting screws. In case of this, you would have to first remove the radio bracket screws, followed by the front air control unit screws. To remove it, reverse the process and don't connect the battery till you perform all the relevant re-learn processes. Removing areas of the instrument panel speakers, need to separate the cable from the negative terminal of the battery and remove the flutter of a screen pillar. To remove the trim panels, the speaker grilles can be popped up with either a plastic trim tool or a screwdriver blade wrapped with a piece of electrical tape, and once the four mounting screws for the speakers and electrical connector are removed, the speakers can be easily taken out. The process of removal is the opposite to installation and afterwards connecting the battery and the necessary re-learn procedures. If the model has door speakers,Detail to detach door trim panels, release the screws that fasten the speakers, pull out the electrical connector, and then, remove the speakers, As for installing the new ones, the process will be just the opposite of the above steps. For rear speakers in coupe models locating of screws is as follows, fold down the rear seat back, remove the trim panel from the upper part of the trunk compartment, take out the speaker mounting screws, disconnect the electrical connector and remove the speakers and the installation process is similar as the removal process. On sedan models, it is necessary to fold the rear seat backs forward, to remove the clips from the seat back latch cover panel and the panel itself, to take out the seat back release handle trim cover, to remove the high-mounted center stop light if the American version of the car is being worked on, to take out the screws from the rear pillar trim covers, to release the clips, and to remove the covers. Remove and relocate the seat belts for the rear parcel shelf, undo the clips and then proceed to remove this shelf, in the speaker removal process you have to take out the screws, and disconnect the electrical connection for the speakers, extraction of the speakers is done in the reverse of the process described above.