I am installing an aftermarket Pioneer NAV unit w/ backup camera, bluetooth etc.

I want to use the factory installed microphone from the bluetooth that comes in the stock head unit.

Does anyone have the wiring diagram/pinouts from the stock head unit that would show where the microphone wiring comes down to the unit?

 

Have you found anything out about this? I have a 2012 cx-9 sport and am trying to figure out the same thing. How to use the factory mic with aftermarket unit.