On the plug for the back of the radio on my 2011 mcs there are two grey wires that are located at the top of the plug. They are with the aux and mic wires. One grey wires goes with the aux wires into a "sleeve casing" looking thing and the other grey wires go with the mic wires. I have no idea what they are and the delar said they didn't know either which I thought was weird. Any help would be great, thanks.