I would like to use a car microphone for bluetooth communication.
The mic is a BMW one: 84316938762.
The wiring diagram (TIS) marks the mic's two connectors for the pin 1 and 2: TIS (X18507).
However measuring with oscilloscope on these pins, there is pretty much nothing. (Measuring in AC mode, 5-10mV range).
How can I use this microphone? (If I need a pre-amp, please post some schematics, or a specific recommendation).
The BT module which I'm using is BC127, there is not too much info about the microphone's requirements.