I have a 2010 Routan w/wireless bluetooth so it is synced up with my iphone. Is it really necessary to get an aux wire to play the music I have on my iphone thru the car stereo? It just seems weird that my phone is syned but I can't access the music. Or can I? I know this is possible w/o a wire on certain models. I have been unable to find an answer to my question in either the manual or the dvd that came with the vehicle. Thx. :-)