ipod (nano 6th gen) not connecting to audio screen

Just got a new 2012 Prius II today. Got in the car with my iPod "splitter" cable adapter (on one end it has the ipod connector and on the other end is the USB & Auxillary cables), my 6th gen ipod nano, and hooked it up only to find that the Audio info was not connecting to the screen. I found that you do not need this "splitter" cable, all you need is your ipod adapter. You can use the that auxillary cable for a Walkman or something ! Glad, I figured it out the first day or i'd be pissed trying. Wish me luck with the car!