The adjustment knob on my xi has 4 positions as someone posted earlier. They just don't seem to actually adjust anything. It rained yesterday, and I kept switching between min and max settings, but noticed no discernable difference in the wiping rate. However, the auto sensor is apparently working, because it briefly stopped raining for a few minutes, and the wipers stopped for that period of time. They kicked back on when the rain started up again. I just can't get them to slow down during a light rain.
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