How do you trigger Riddler buttons that are mounted on the wall? [duplicate]
You want to glide into the wall on the button. Batman will activate it, and you can push off and glide elsewhere. You'll want to start on top of a building then glide down to it.
Buttons on walls tend to turn up in sets of three, all of which need to be pressed without touching anything that's not a button. Don't be surprised if it turns off when you land.