How do they work? Most of time they work fine in my car but usually it goes crazy max speed even when there’s little rain, and also at lowest speed when it’s pouring rain…
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There is a sensor usually behind you rear view mirror it detects water on the glass, it will be in the arc of one of your wiper blades so the rain is cleared from the sensor area when it wipes.
The sensors work on change rather than level and “recalibrate to zero” when the wiper clears the water.
Some systems also use the intermittent wiper rate control (the variable adjuster on your wiper control stick) as a sensitivity setting control.
It may be that you are inadvertently adjusting the sensitivity by altering the intermittent wiper control.
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