Hands-free mic location for VF is behind the drivers side slots in the overhead dome lamp assembly. Had this apart recently to install my garage remote. Mic assembly is just a small module with a couple of wires heading off to a connector clipped close by in the lamp assembly (one of those Bastards Inc connectors you need three hands and a sharp instrument to separate types!) Easily unclips and removes if needed. There was nothing behind the passenger side slots on my MY17 VFII SV6, maybe Calais gets two mics? Unsure. Cheers.