The sensor is mounted on the windshield. A two-piece shell covers the sensor and the arm of the rear view mirror. You can snap off the covers easily to check. hold both sides, and pull them apart by bending them and they come right off.

not sure if this is the case, but if your wiper stalk is in position 1 when you turn on the vehicle, you need to put it into position 0 and put it back in position to activate it.

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