steering wheel buttons
 

Hi,
anyone know the colour coding for the wire that go to the steering wheel buttons?
I have a Nokia ck7w hands free kit which cuts off the radio when in use and is very good, much cheaper than BMW bluetooth.
I have a spare control button for the Nokia kit and want to splice the wiring into the steering wheel buttons for volume and the telephone button, I am really sure this can be done and will post pics and details if it works? just need the wire colour codes? anyone got them or can tellme where to find them?
thanks
pete:thumbup: