I am sorry for this, but I couldn't find it! The "in between sunvisor" region contain the 2 map lights, rear miror, 6 buttons for 3 garrage remotes + OnStar + the plus sign + one more (i don't remember), micro phone for OnStar and Voice, little blue lights for cool looking at night. I thing there are some more, but not the sunglass holder. I know where it supposts to be because I have an accord and I do know how it look.

The manual says nothing about it. The tech check list says "sungallsses holder working properly" where the MDX delivered to me???