Lexus SC 430 2006, Owner'S Manual

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2-3. Operating the headlight and windshield wipers
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Windshield wiper features
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When the washer button is pressed with the wipers OFF, the wipers will make 3
sweeps, then pause, then a final sweep to completely clear the windshield*. The
length of the pause will depend on the vehicle speed. The last sweep will not
happen if the vehicle is traveling above 106 mph (170km/h).
*The last single sweep can be deactivated. (

P.323)
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When the outside temperature is below 77 °F (25 °C), operating the wind-
shield wipers will automatically turn on the rear window and outside rear view
mirror defoggers.
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If no windshield washer fluid sprays
Check that there is washer fluid in the windshield washer fluid reservoir, and that the
washer nozzles are not blocked.
NOTICE
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If the washer switch is pressed and held continually
Damage to the washer fluid pump may be caused, if the washer switch is pressed
and held continually.
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When the windshield is dry
Do not use the wipers, as they may damage the windshield.