Originally Posted by DrD123
the power source for the mirror is switched - you could always run your own wire from elsewhere under the dash from a constant +12V so that it's always on. Our van has the homelink always on - not a good idea, imho. Had a friend get their garage broken into when they parked in the driveway - someone got into the car, opened the garage, and made off with their tools - not cool!
Yes, it's a security feature. One of the many excellent reasons to use Homelink rather than a separate garage door opener, IMO. Thought: the radio turns on if you have the key in but not turned on 5th gens, right? Why not plumb it off that circuit?