Originally Posted by drz
^^ If he is saying that, he is wrong. No, the wiring harness does not do that. One might be able to get the radio control functionality if the correct wiring harness is used, but even that is just a maybe.
Are you talking about me?
Anyways here is the retrofit pdf that I so kindly hosted for everyone. http://www.angelfire.com/myband2/ds/3543en.pdf
Basicaly it consists of 3 wires in the harness total. BMW sells this but... the catch is it comes with the airbag that has the button so it's a retrofit kit and costs $$$.
The cars that do not come with the multifunctional wheel/buttons have a cruise control module but it just doesn't have the proper wire installed to make it work by just installing the buttons and the same goes for the radio controls I know because I have done this.
Theres a 10 pin connector to the slip ring andpin 8, 9, 10 are dedicated to the multifunction steering wheels harness 2 of the pins connect to 2 wires in the LCM's harness that you need to tap. Those are for the radio functions, and the 3rd pin connects to a empty pin slot in a 54 pin connector in the ECU box in the engine bay. That is for the cruise control function.