Toyota PRIUS 50 2020 Series Owner's Manual page 235

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The windshield wipers and washer can be operated when
The power switch is in ON mode.
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Dripping prevention wiper sweep (vehicles with rain-sensing windshield
wipers)
After washing and wiping operation several times, the wipers operate one
more time after a short delay to prevent dripping. However, this function will
not operate while driving.
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Raindrop sensor (vehicles with rain-sensing windshield wipers)
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The raindrop sensor judges the amount
of raindrops.
An optical sensor is adopted. It may not
operate properly when sunlight from the
rising or setting of the sun intermittently
strikes the windshield, or if bugs etc. are
present on the windshield.
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If the wiper switch is turned to the
ON mode, the wipers will operate once to show that AUTO mode is acti-
vated.
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If the wiper sensitivity is adjusted to higher, the wiper may operate once to
indicate the change of sensitivity.
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If the temperature of the raindrop sensor is 85C (185F) or higher, or -15°C
(5°F) or lower, automatic operation may not occur. In this case, operate the
wipers in any mode other than AUTO mode.
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If no windshield washer fluid sprays
Check that the washer nozzles are not blocked if there is washer fluid in the
washer fluid tank.
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Customization
Settings of AUTO mode operation can be changed. (Customizable features:
P. 518)
4-3. Operating the lights and wipers
position while the power switch is in
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