CD Changer Help

I have a 2001 VW Jetta TDI with the 6 disc cd changer in the back. It suddenly stopped working. When I push the cd button it says 'disc error' When I tried to eject the changer from the back it will not. Is there any fuses and what and where are they? Do you know the coloring code for the wiring to the cd player? What is power, what's ground, etc?