I cant find a wiring diagram, but I will assume because the homelink mirror is an after factory upgrade, the cars should all have the connector for it up in the headliner. you'll just have to figure out what wired are power and ground. you could also just find the power wire for it and then ground the new mirror to the body somewhere then just throw some plastidip over it to seal it up. It's not the best choice, but it will work. However the best way to do it is going to be running your own wire with an inline fuse, or running it though an unused slot in the fuse box. The problem I see with connecting it to the existing power for the mirror is it's always on. seems like it will be a battery drain unless you also add a switch to turn it on and off manually. Thats actually not a bad idea considering the comment elantra fan made. It is actually illegal to have them in some states so being able to make it seem like you dont could save you from a ticket. My suggestion would be to make one of your reading lights the switch. That light wont work for light anymore, but it will also give you an almost completely undetectable install. You could actually use that as your power source as well.