I'll post the diagrams soon, just very busy at work right now.

to answer your question, when you cut the wires in the ribbon, you will have three wires out from the CD module and three wires in to the main board. these wires are soldered into a switch that toggles between two inputs. one input is the output of the cd module, the other input is wired to a bare 1/8" stereo jack. the output of the switch is wired back into the ribbon going to the main board. I personally bought myself a blitzsafe universal IPOD adapter (ipod -> RCA jacks) and just used a 1/8" stereo jack to RCA adapter cable between the ipod adapter and the 1/8" stereo jack. I wouldn't start taking your head unit apart until you completely understand the process.

whitman