CAR BLUETOOTH AUX RECEIVER AUDIO ADAPTER 
FOR BMW
Fits BMW E60 E63 E64 E83 E85 E90 E93 SERIES X3 Z4

Please check your connector on your head unit

Wire the unit to a suitable + and - supply from your vehicle
Plug the unit into the back of your head unit
Pair your phone to the bluetooth signal
Select aux-in on your headset and you can then play music from your phone directly to your car speakers