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A 5V source, a 1k series resistor and 47uF bipolar capacitor seems to make the BMW mic work. It gives 3.2V at the mic input, which gives 1,4V swing. I have tried it on my desktop computer. It will be interesting to see how it works in the car.


I bought the upgraded microphone, 84 31 - 6 93 87 62.

White +
Green - 
Brown shield