It was a serious question because it is probably the most talked about topic regarding the ipod. "How do I connect my ipod/iPhone to listen through car stereo speakers." I didn't see your link in the topic and just assumed you were trying to connect with your charging cables.
That notwithstanding, it looks like the iPod end of the cable cluster has a dock adapter, 2 RCA plugs, and a headphone plug. Assuming you wired the other end(s) properly to your Pioneer head unit, what happens when you put the headphone plug in the iPhone's headphone jack? (You may need an adapter to get the plug to fit in the iPhone's recessed jack.)
Does your head unit have an AUX IN port? If so, playing iPhone audio in the car is as simple as using a cable like this one. You can then use a separate car charger if you like.