apparently OEM turn signal functionality went through the stereo.
I always find this uber stupid. Like, seriously?
Blasting music and forgot to turn it off after a merge, probably.
I've only seen that "3 clicks" thing in 3 vehicles - all of which are 2012 or newer. I didn't even know it was a thing until recently. I wish every car did have that though - it would help a lot with exactly that issue...