what is this sensor in the center
 

In the map light casing on my 2013 I have two sensors on the ends plus one in the center. What are they for? Is the one in the center a mic for the voice activation stuff?

I'd say yes if you've got the voice activation stuff.

You could always find out the old fashioned way.....Read the owners manual. I know it's kind of tedious, but I actually read the entire "on-line" manuals for my 2012 on a boring winter Sunday afternoon. There's actually some good info in there that you normally wouldn't research. :tup

That was my first approach but the owners manual is mute on the sensors. I was going to get some chrome covers to spruce it up but their are none available that have the center hole exposed.