If you have the owners manual look at page 222 "Ambient Lights" (I would do a screenshot and post it but I'm on my phone). That button is for the the ambient lights (the two little dots below that button). From the manual "When the parking lights are on, push the ambient light switch to turn the ambient lights on."Just a quick bump to this thread if someone could kindly tell me what the little button between the map lights in LDB415's picture above does I'd appreciate it. Tried looking through my owners manual and through this forum and couldn't find an answer. From what I could tell it doesn't do anything but perhaps I'm secretly launching nuclear missiles somewhere.