Sooo many people talk about a solution, but heres a solution.
Im using an AVIC-Z3 with the CD-IB100II Issues and I can 100% charge my iPhone SG3 (16GB) with the Kensington 4-in-1 Car Charger. I got it from amazon for about $21.99 from amazon. Works GREAT.
Downside is: If you are plugging it directly into your iPhone you may have issues with your case, as with most adapters. I have a silicon case and hafta move it around a bit to make it fit. But if your also like me, where you have a seperate dock (like my Pro-Clip dock thats coming) it won't matter much since the kensington will get plugged into the button of my pro-clip.