I got the auto mirror that does not have homelink, nor compass, nor any lights. Nothing fancy, just the auto mirror. That one just has two wires, + and ground.
Simple enough installation, except the wire shown in dhouse's DIY is a different color on the 06 SI. Mine was a green wire with a silver stripe. It is in the same location as the one shown in dhouse's picture above. Looking at the non clip side of the green connector, it is the 4th wire from the right.
http://static.flickr.com/109/2909027...cdaf04.jpg?v=0
dhouse, I hope you don't mind that I used your picture.
Hope this helps.