Bose audiopilot microphone

dans3.0

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Hi all,
have an A4 Cabriolet with RNS E and Bose but dont think the microphone is working on the audiopilot as the volume does not seem to raise with the noise level all seems to be coded correctly and the bose pin is grounded.
Whats the best way to check the function of the mike
Thanks in advance
Dan