The automatic liftgate on my 2017 Highlander suddenly stopped working and I couldn't figure out why. I thought there might be something wrong with the door glass in the liftgate and that perhaps the sensor wasn't indicating it was closed, which would keep the liftgate from opening or closing; but after checking it closely, that didn't appear to be the problem. I also tried resetting the liftgate height, but that also wasn't the problem.
Then I found a post on this site that revealed there is a power button for the liftgate inside the door of the glove box. Huh? What the heck is that for and why is it located there. That seems very random. But I suddenly remembered that I started having the liftgate problem right around the time I removed the glove box to replace my cabin air filter, so I ran out to my Highlander and discovered the liftgate power button behind the glove box door wasn't depressed. I pushed the power switch and voila, my automatic liftgate started working again. I can only assume I must have inadvertently pressed the liftgate power button when I was changing the cabin air filter.
Took me a couple days to figure it out but I'm glad I did before taking it to a Toyota dealer and paying an arm and a leg to have them "check it out."