I searched ipod no sound and didn't really get any results. I just installed a AVIC-F90BT over the weekend. I have sound from Sirius, AM, FM, CD, DVD. I plug in my iPod and I get a beep from the iPod. It shows up in the list of sources and the iPod shows Pioneer on the screen.
I can access the playlists, the songs, and etc. It shows to be playing but I don't have any sound.
I have tried with an early 2 or 3G ipod nano and a iPhone 3G, and a 1G ipod touch. No luck with any of them.