Join Date: Apr 2015
Location: Bend, OR
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The rain sensor is something that is not easy to explain. It uses a number of variables to determine when to wipe and when to rest.
Basically - if driving is steady rain, they will wipe constantly (provided you are driving are a constant speed). The faster the speed, the more the sensitivity is adjusted. Should you stop at an intersection, the rate of wipe will decrease or stop as a result of the wheels not turning and you not needing as much forward visibility.
One way that I learned about the reaction of the wipers was driving next to semi who splashed a large puddle onto my car. The wipers went to super fast wipe mode for 3 or 4 cycles, then returned to a slower, more regular pattern.
Hopefully this adds a little extra clarification. Rogers was more detailed.
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