its a 3 wire hookup. ground, constant power, and ignition. also I just bought a clip thing from autozone that cost $3. That just glued to the window. I ran the wire up through the top to the pillar on the passenger side. Very easy to do.
Now the trick to this. Every single homelink mirror is almost exactly the same for every car. I got lucky and found a used one where someone did the generic wiring on ebay. The mirror was $127 and it took me about 10minutes to install because i soldered all the connections and was careful on running the wires.