Why the heck would I want that? I most certainly wouldn't want that to happen, unless I was parallel parking, and that's about 0.01% of the time I'm in reverse.
I don't know how you have the mirrors adjusted, but I have them adjusted so I can see cars and people behind me. I don't want them pointing at the ground unless I'm looking at the curb to parallel park, which is maybe once a year.
In my case I back into my garage and I look at the lines in my floor to make sure it in the right spot.
I can see the lines on the parking spaces at work when I back in without adjusting the mirrors, no problem. Man, if I had a car that did this, I would disable it immediately. My biggest concern when backing up is people or cars popping out behind me from the sides where I can't see. Not being able to see them in the mirrors would make the problem 10 times worse.
Like I said, "unless I was parallel parking". But really, I do that maybe once a year. All the other times I'm backing up, I'm looking for cars and people, not the ground.
I have this option on my truck, and I have disabled it. Even though the truck is up so high (4WD) you'd think it would be useful, but it's not. Even with a ditch at the end of my drive. With the mirrors pointed down, I can't see where I'm going which is more important than where I'm at - I already know where I'm at because I saw where I was going a few seconds ago. The perspective is just too disorienting.
It was a cool feature but I think it's less of a necessity with a backup camera. On my Gen 3 without guidelines, there are two "T" markers to mark the edge of the bumper (and used for aligning the camera if it goes out of alignment due to bumper replacement or collision). They mark corner of the car well. With guidelines, you can use that to judge the edge of the car and how close it is to the curb. On the 2014 Corolla rental and our 2016, when the line is at the edge of the curb, I'm usually within the proper distance. If the line is at the bottom of the curb (i.e. where the curb meets the road), I'm too far. Otherwise, I usually lean over to check the passenger side mirror.
Maybe it'd be good if it wasn't automatic, tied to reverse. But yeah, right up there with auto-folding: something that'll happen constantly, rarely needed, and just another failure-prone feature.
You'll be able to turn it on/off. Using the mirror control switch, if the switch in the centre, no mirrors will tilt. if you move it to "R", then the passenger side will tilt down. Ditto if you move it to "L" (if equipped. Not all cars have the tilt-function on both mirrors)
Yeah, I remember our discussion, tracing the evolution of the side mirror, lol. Way back when, you cranked down the window, grabbed ahold of the mirror (squinting in the windstream), nudged it back and forth.
