A quick tip to prs0303 and Hierog:
In the future, before spending hundreds of dollars on a new headunit for your automobile, do some research. Do it for any major purchase in life for that matter.
I could understand if the unit didn't do something it specifically said that it would - in that case, I would be completely in your corner, and urge you to return it to wherever you made your purchase and get a refund. But when Pioneers puts on their website all the pertinent information that one should need to find out anything about this unit (i.e., operating manuals, installation instructions, and compatibility charts) you really have all you need to know what to expect to have on hand before you ever make your purchase. Be it wiring harnesses, antenna splitters, and yes, the correct version of iPod to utilize the USB function.
It isn't "weak" of Pioneer; it's "weak" of you to not have researched the correct version of iPod needed to connect using the USB cable. Heck, Pioneer should be commended to have included a front A/V plug that still allows you to actually USE your dated iPod model.
spta97 at least admits it was his error in not checking that out ahead of time.
Do some legwork your self in the future and you will be less likely to be disappointed. This post is to merely help you become aware of how this is not a Pioneer mistake but your own. I hope you take it as helpful advice only as I am not trying to be a d*ck about it.
I spent maaaany hours looking over everything I needed for this unit, and made sure everything I was truly after in an aftermarket headunit was available in this unit, and that it would work both in my particular make of automobile and the other electronic elements I currently owned.