2002 nissan xterra se/sc, radio troublesh

My radio doesn't work anymore. It began with occasionnal lost of radio/cd and display followed by a total lost. At the begginning, I could hear the sound of the 6 CD charger working even if I didn't have any display and any music out of the radio. But now, I got absolutely nothing except for the illumination part of it. Any idea of what I should try and by the way any wiring diagrams would be very helpfull right now. Tow