Microphone stopped working

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BIMMERPOST / Classifieds

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Item Interest

In February I worked with a coder from this board to retrofit OEM Bluetooth calling to my Combox (2011.5). It worked perfectly for 7 months. Then I went to the dealer for the battery cable recall, and when I got the car back, Bluetooth still works (connects phone to car, and I can make calls) but the microphone is not working either for calls or voice commands.

My coder checked and it says there is an error with the wiring. I tested the continuity from Combox to microphone and it's still solid. What could be the issue? Maybe the mic itself is bad but that seems unlikely.