Steering wheel controls

[PeterK2003]

I know this is answered else where but i can't find it for some reason....

What do i need to hook up the steering wheel controls to a head unit such as a Pioneer AVH-P4000DVD (http://www.newegg.com/Product/Product.aspx?Item=N82E16882117226).

Also I saw somewhere a how to on making the head unit garage door thing automatically go up and down when the car is turned on/off if anyone know where that is i would applicate a link.

Thanks!

[Stryker Trailwood]

http://www.tcover.net/index.html

[PeterK2003]

hmm the one i saw before was simpler than that i believe.

Thanks.