That's it. I tested that wire, 14V car on, 12V after turning car off and head unit/sound still active. 0V once the vehicle is locked and head unit is off.
Must be the power antenna wire.
Admins, can we sticky this thread? This is essential for anyone looking to add a trunk subwoofer with Technic's harness (or any method) in the '11+ F25 X3.
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