Sorry, Did not mean to come across like that.
If you wouldn't mind, what splitter cable do you have?
30 Pin -> USB & 1/8" Stereo (Called BMW iPod Interface Adapter)
or
30 Pin -> USB & 1/8" Stereo & Accessory Port/Cigarette Lighter Plug (Called BMW iPhone Charging Cable)
I'm Just trying to understand, because on the BMW accessory finder those both show up on several model years including 2011, but disappear when you select 2012 model year.
Also side note, when I tested with my car I first tried an aftermarket cable I happened to have near the garage and it did not work, but when I used an genuine apple cable it works no problem.
The interface adapter