I have the same problem My vehicle was built in may 02 and the Aux audio Cable Did not work.

My vehicle has DSP, Business CD, BMW OEM Phone, Prewired fro Sirius, No Nav, No CD Changer but i did find the 3 pin cable in the back of my car but i cant find the coax cable Dice DUo or Mediabridge uses, unless its plugged into something else i havent seen it. Does anyone know where i can find the coax cable in my car?

Also is there a group buy for the forum or any place you may recommend to buy a Dice DUO or Mediabridge from? Ive only found them on ebay but im not so sure about ordering it from them and i have no idea which model i need to order or what to order at this point