Originally Posted by shawnsheridan
The Combox allows for iPhone/iPod one-wire integration using the original white Apple USB cable; however, from what I understand, even Combox equipped cars require a Y-cable to control older iPods:
iPod Generation 1 through 4
iPod Nano Generation 1 through 2
And the new Y-Cable of course is needed if you want video assuming the vehicle is capable of it.
I think what makes the difference is if your ipod/iphone supports ipod accessory control. It was introduced with 3rd gen iPod.