BIG HEADS-UP...*triple* check your fuses. Your owner manual will describe the exact location, but there's a big yellow boxy one in the interior fusebox that I discovered, after installing the switch, to be loose! When I went back out to my car to go to work, the fan didn't come on, and on a hunch I just tapped the bottom of my fusebox and it came on, so that fuse definitely is suspect.
For all I know, it was the problem all along.
