So I had the same thought as you and discovered something. When I’m backing out of my garage straight, there’s no noise, even though the garage door is in the “red” area of the sensor. However, if I turn the wheel so that the sensor detects that I would actually hit the door, it beeps. If I straighten the wheel, it goes quiet again. So I think the sound is more of a “if you keep going, you’ll hit something” rather than a general “you’re close to something” like in other cars.
Does that make sense?
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