I have a 420 SEL with the stock stereo and all four speakers have gone mute on me. I am hoping this could be a quick fix and was wondering what the possible causes are. The radio itself works, all buttons work and i can change stations, but no sound is produced on all speakers. I was wondering whether the connections behind the radio became disconnected/fried or if something with the fader is causing this, because the fader had not been working very well for the past few months. I am contemplating replacing the radio and speakers, but am really hoping that the wiring doesn't need to be replaced.
Thanks