Lexus GS 450h 2008 Owner's Manual page 165

Rain drop sensor
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If no windshield washer fluid sprays
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Check that the washer nozzles are not blocked if there is washer fluid in the wind-
shield washer fluid reservoir.
In extremely hot or cold weather
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The system will turn off if the windshield gets extremely hot (at more than 176°F
[80°C]) or cold (at less than 14°F [-10°C]).
Customization that can be configured at Lexus dealer
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Settings (e.g. drip prevention function) can be changed.
(Customizable features →P. 573)
2-3. Operating the lights and windshield wipers
The sensor judges the amount of raindrops.
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