I am replacing the standard audio system (Clarion PF-3496) in my 2014 Forester with a Kenwood DNX575S GPS Navigation System. The Kenwood comes with a microphone to be clipped to the dash but I would like to use the existing handsfree microphone in the overhead console if possible. The Kenwood mike has 2 wires with a 3.5mm plug. The overhead mike has 3 wires. See attached shapshot from the service manual. The W and W/B wires are a twisted pair so should be the signal. What is the function of the Gr wire? Has anyone successfully done this?

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