Am wondering where/how the wiper rain sensors on my '08 Lucerne
are located and how they 'sense'. At a stop, they don't really
seem to work all that well. Window is pretty well completely
covered and they don't come on. While moving, they do a better
job, for the most part, speed up as the rain becomes heavier.
However a passing vehicle with the large 'mist spray' doesn't
seem to activate them very well.
Around the rear view mirror you will see a sort of screen on the windshield;
that is the sensor.
By adjusting the timing of the intermittent wipers you change the reaction
to the sensor. One the lowest speed it does not react very well. One notch
up is a big improvement under the most adverse and changing conditions.
When the car is moving the windshield collects rain water faster because
you're moving into the water. That's why you notice less wiper activity
while the car is stationary.
Have you tried increasing the sensitivity by rotating the knob on the turn
signal lever? Each detent on the lever will make the wiper more sensitive
to the amount of water on the windshield.
Not quite the greatest thing since canned beer
but a darn good system.
Remember too that when you are using rain sense
and after it activates, your headlights will be
controlled by Rain Sense (this meets some state
law requirements), not by the day-night sensor
or the /Twilight/ timer. So, they may stay on
until the kill function in the Battery saver
shuts them down.
Good scheme is to always shut off the wipers as
you pull into the garage.
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