Mirror Tap
I had the same setup (Best Buy Geek Squad install) in my old F22, the radar detector and dash cam stayed on for a few minutes after shutting the car off. I wanted Best Buy to transfer my setup when I traded up to the M3, but they refused to touch it due to liabilities. I went to an install shop that routed the wire to the trunk, now the detector and dash cam both turn on and off with the car.
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