Micah is a gadget kind of guy. He loves buttons and knobs and dials, and pretty much instinctively knows how to use them and what they're for. It's pretty impressive, really. I can't even turn the TV on to watch a movie without having to ask the kids which remote does what. (True story.)
There is a button on the dash panel that look like this.
Micah is fascinated with that button. He tries to imitate what that hand is signing, and pretty much just gives the I Love You sign. He'll hold his hand down near it, trying to copy exactly what it says. He finally realized that it's a button that you need to push, which is odd since he's all about buttons. I guess to a nonverbal kid, signs come before buttons? He started out making the sign and then pushing the button, and has since graduated on to just pushing the button when he remembers it's there.
The unfortunate thing is that it's far, far too hot to have his seat warmer turned on. His wee bottom has to get so uncomfortable.