Mirror issues, dead battery

We have a 2012 Prius that came with a standard rear view mirror. I installed a GenTex mirror with auto-dimming and HomeLink. Following the install instructions that Toyota had online I hooked up the Red wire to constant power for the dimming and the other wire for the home link to keyed power. I grounded the ground wire to the car frame. Both functions work with the dimming feature green light on at all times. Yesterday the 12 volt battery was dead and I had to jump the car to start it. I turned off the green light. Dimmming and Homelink are all the features this mirror has.
Did the green light kill the battery and should I have connected both wired to the keyed power? It's my wife's car and I'd hate to have her on the side of the road because the starting battery went dead. Has someone who has done this upgrade had this issue? What would folks suggest I do next.

 

The battery was purchased in June 2019. It only went dead once before when my wife left the interior lights on for several days. I replaced all of the interior with LEDs. I can't find anywhere how much the green light on the mirror actually draws. Or if I should only use keyed power.

 

From everything I have read it is my understanding that the HomeLink is switched so no one could have open access to your home any time the car isn't locked. Is this incorrect?

 

That's probably what I'll end up doing. I have two vehicles with homelink. A Dakota and a 330Ci, neither one of them will operate the garage door when the key is off. I'm frankly surprised that your vehicle will operate that way.

 

Does anyone know if I hook both wires up to the keyed power wire if that would negatively affect the mirror performance?

 

Thanks for the comment, but I don't really understand what you mean.

 

Thanks.

 

Actually I don't know. I followed the Toyota install instructions and it said to connect the red wire to constant hot wire and the Homelink wire to keyed power. I'm going to put both on Keyed power tomorrow. At this point I'm getting quite fast at taking interior parts apart.

 

I thought I should wrap this up. This morning I connected both Gentex wires to the keyed power wire (light blue) and everything seems to work fine. This should eliminate any drain on the 12 V battery when the car is turned off. Just to check I experimented with our other two vehicles with auto-dim and HomeLink. I got a surprise. On my 2002 BMW 330Ci the key has to be in the ignition and turned on for the HomeLink to function. The HomeLink buttons are on the mirror. On my 2002 Dodge Dakota the HomeLink, which is not on the mirror but in the headliner works all of the time.
I live in a very rural area and have never locked my truck which is parked outside. I will now lock it up all the time. For more than ten years anyone could have entered our house using the truck HomeLink. My truck is always parked at least a hundred feet from the garage doors, and it still works from that distance. Not a very safe situation.
Hopefully my wife will never be stuck with a dead battery in the Prius again. She does like the convenience of the HomeLink which was the biggest reason to do this in the first place. She doesn't drive much at night so just how well the auto-dim works we aren't sure. My $25 mirror project is complete. Thanks everyone for the information on this now finished project.