Enabling the Vehicle Camera Microphone
Before you can enable the vehicle camera microphone, it must be connected to the Aux2 input on the stereo.
If the connected vehicle camera includes a microphone, you can enable or disable the microphone in the camera viewer.
Select 
> Camera > 
> Mic Installed.
> Camera > > Mic Installed. When the microphone is enabled, 
appears on the camera screen.