Sorry to revive an old thread, but I did some digging into older threads and re-researched the info here. AFAIK
these sensors should plug in somewhere and just be turned on by a tech. And that mirror will not work with those who have Sync because it doesn't house the microphones of which Sync uses. That part number that I got was wrong. (Which makes me mad.) But if we can find someone who was willing to play with their car and has these sensors, we could potentially find out where these sensors are, where they plug into, their part numbers, and how they are enabled.