My 04 545i came from the factory with a 6 disc changer (codeS672A) and pre-wired for satelite radio (codeS693A) Well I found there is a ipod connection in the glovebox looking for the 6disc changer. Well I did test it and it works but Id rather have a aux jack. Could it be as easy changing/swapping cables ipod for Aux? Would further coding be needed or is the coding just to open the option for either or??