Alpine CDA-9857 CD Player "car radio turns sound vw" Questions

...radio works and there is sound coming from the speakers, but when I insert a CD or plug in the iPod through the KCA-420i there is no sound, but it displays what song is playing on the screen. I have ...

...sound level is different. Doesn't happen on radio/CD/iPod. Nothing in the vehicle has changed, including settings on the head unit, in many months. This is installed in a 2002 VW Passat with Monsoon. ...

...car is a 1996 VW Jetta......find two wires loose (1 orange/white...one red/white.....not from harness.....seems there is either a problem in the wiring or in the audio output from the radio.......is ...