Help with factory radio audio

[silversilverado_ltz]

I bought a 2010 silverado ltz and it came with a mylink radio with NAV, BT, everything works (truck was sold with pretty much every option so not sure why someone put this in) I did some research and it looks like this is common in buick enclaves/terrains, acadia etc.

So everything works except the voice control in the radio and obviously when I make a call or try to talk no one can here me. (onstar mic works with onstar not radio I tested this by talking to onstar).

 

What I want to know is, what pins would be for the microphone? I cant find a wiring diagram or a picture with a factory power plug that shows which is microphone. I just want to hook up an external generic mic. Im attaching some pictures so hopefully someone will see it and know.

Links to images below (until I figure out how to add pictures within the post)

 

https://ibb.co/capisQ

https://ibb.co/jqvCmk

https://ibb.co/mQA1e5

https://ibb.co/hVqdRk