Just a little tip
If you change your OEM-Radio with Steering Wheel Control you better look for a Radio with IR-Control like my Pioneer 1.5 DIN DEH-P77DH or Radios from other manufactures with this option. Then you can use your Steering Wheel Control with the Aftermarket Radio.
In my case I simply bought the SWI-X Universal Steering Wheel Radio Control Interface from PAC (
http://www.pac-audio.com/ ) for a Amount of 40 Dollar
The build-in and programming took only 20 minutes and I can use all of my buttons for there original destination. Also you are able to programm special radiofunctions to every single button you prefer.