Hi,
For people who also will or have replaced the standard BMW radio unit with a DIN unit, there is new can bus interface available for the E89. It supports the main car stereo manufacturers like Sony, Kenwood, Pioneer and many more.
http://www.crutchfield.com/S-6oB01hdGXxj/g_118900/Steering-Wheel-Audio-Control-Adapters.html
EdP
For people who also will or have replaced the standard BMW radio unit with a DIN unit, there is new can bus interface available for the E89. It supports the main car stereo manufacturers like Sony, Kenwood, Pioneer and many more.
http://www.crutchfield.com/S-6oB01hdGXxj/g_118900/Steering-Wheel-Audio-Control-Adapters.html
EdP