ip-bus to rca adapter

[cal_gecko]

I've got a Pioneer Premier Head Unit in my car, and it's got an ip-bus cable in the back for the aux-in (cd changer or xm radio).. I'm guessing this is some type of proprietary plug, because I'm having a heck of a time finding anything for it. I want to be able to plug in my Rio Nitrus into the aux-in of my head unit... and it seems like the only way I can do that is to get an ip-bus to rca adapter, then get an rca adapter that will plug into my Nitrus.

Anyone else do anything similar, and is there an alternative to buying one of these ridiculously expensive adapters? the cheapest I've been able to find one is about $30.

Thanks!

 

[cal_gecko]

nothing???