Hello all,

The audio is nearly useless in my car. Sometimes it works and sometimes it doesn't. When it works, everything works. USB, radio, etc. When it doesn't work, there's no audio at all. The display shows a radio station or progress through whatever MP3 is playing, but there's no audio. I've considered replacing the factory amp (if there is one), and then the radio/CD/MP3 unit, if necessary. Trouble is, I have no idea where the amp is. Can anyone point me to a diagram/images/anything?

Thanks!