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I'm using the OnStar mic for voice input into my car pc. I just spliced the wires at 8 and 9 (gray and bare) and plugged them directly into my mic input on my mobo. Works great for both voice control and OnStar.
RPM_VR4, if you are trying to use the OnStar mic without the OnStar module than you need to bias it. I tried biasing with a 1K resister to 9V and that worked fine. I also did a 1k/1k voltage divider to the 12V car supply and that worked, too. I don't know if there will be noise issues with using the car supply, though, so it may be prudent to use a voltage regulator.
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