Its just where you connect the AUX. The back of the HU unit (I did in the E83) and some buy the tuner (I did in the E46). I have NAV in both so the connectors are different. Just look at where in back of the radio you connect. The other AUX diagrams are more to see how you fit the resistor/capacitor in place.

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1