I'm looking to install the microphone on my RER radio. From what I'm seeing, there's supposed to be an empty area in the back of the radio for the microphone, but when I look at the back of my radio, all plugs are full. What am I missing here? The radio was added aftermarket, and as far as I can tell, there is no mic anywhere because when I press the uconnect button and she says to say a command, she doesn't hear anything I say or respond to anything I say. See the pic here: https://dl.dropboxusercontent.com/u/...612_145311.jpg
The head unit was installed aftermarket. Thanks.