good deal I would say for any future buyer. Sux you couldn't get it working. I can say this that the AuX does work since that is my setup. Did you Enable the AUX option in the preconfig of the receiver, cause if you didn't, then it won't let you enter aux mode?
There's a trick to get it working. I was wanting to buy a Pioneer HU and I remember reading about some special way to get the aux in working. I'll see if I can find a link.
edit: found it in another thread here....
I have the DEH-P85 (GM/CHrysler Perfict Fit), and it has both the AUX and MCD modes. TO enable them, I have to press and hold the Function button (with the unit off). This accesses the main menu, and it is also where I can turn on/off the DFS alarm, warning, dimmer, etc...
Its also very cool because I can label the aux input, so mine reads MP3(of course )