The standard stereo in the Nissan Altima provides good sound, but some drivers may want to upgrade the factory system to get additional power out of the stereo. Whatever the case, you can easily remove the stereo in a Nissan Altima and replace it with whatever you want.
Disconnect the negative cable from the negative battery terminal. To do this, turn the retaining bolt on the cable clamp counterclockwise until the clamp is loose enough to pull off the battery terminal.
Wedge the flat-head screwdriver under the trim surrounding the air-conditioning controls. Pry the trim out of place as it is held in with retaining clips. Work your way around the outside of the trim piece until the trim pops off.
Remove the screw on the right-hand side that is holding the trim around the bezel in place. You can only access this once you've removed the trim around the air-conditioning. Once you remove this one screw, the trim piece around the radio will come right off.
Remove the four screws that hold the stereo in place. Once you've removed these four screws, the radio will pull right out of the dash.
Unplug the electrical connections in the back of the stereo and finish removing the stereo. These connectors are plug-style connectors. Squeeze the end of the connector, and pull it out of the back of the stereo.
