Nope. Fan was in the other grille and yes it was filthy, but quiet.
Mic was very obviously a mic. I google the part number before cutting just to be sure. GM Part No.: 25783504 - Microphone Asm-Radio Volume Compensator Interior Noise. More pics of it
HERE.
The Active Noise Cancelling (ANC) of the Bose system freaks out when you tap into it for subwoofer signal and feeds a bunch of noise into the system. There are no settings for it in the head unit software to disable it. By cutting a mic it disables itself. ANC doresnt work for crap anyways. Same exact issue and resolution as my Infiniti when I tapped into its Bose system.