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I think it is based on the distance traveled. When I had an in-town ~5 mile commute withthe car parked near the sensors at night, I would get no light. Now I have a longer commute (~25 miles each way) and the light will come on on my way into work. It will reset at night when parked near the tires.
Both trips took the same amount of time despite the difference in distance (which is why I moved), so I believe it to be distance based rather than time - based.
I suppose I could do some science on it to find the trigger point, but since I can read a tire pressure gauge I have very little use for this system.
-Justin
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