I think you missunderstand me. sorry for my bad english.
i try it again:
when i connect with the Apple cable, nothing happens. I drive dont show the phone as not connected.
when i now take ONLY the USB Part from the Y-cable (im only talking about idrive connectivity) the iphone are displayed in idrive as connected, I can choose playlists etc.
ok, I need the Aux jack to enable sound, but I'm interetestd, why there is an USB connection possible and with the Apple cable an USB Connection is not possible.