Lexus 2007 GS430 Quick Manual page 197

The windshield wiper and washer can be operated when
n
The engine switch is in "IG-ON" mode.
Dripping prevention wiper sweep
n
After washing and wiping operation several times, the wipers operate one more
time after a short delay to prevent dripping.
However, the last sweep will not happen if the vehicle is traveling above 106 mph
(170 km/h).
Effects of vehicle speed on wiper operation
n
Vehicle speed affects the following even when the wipers are not in "AUTO" mode.
Intermittent wiper interval ("INT" mode)
l
Wiper operation when the washer is being used (delay until drip prevention
l
wiper sweep occurs)
With "LO" selected, wiper operation will be switched from low speed to intermit-
tent wiper operation only when the vehicle is stationary.
Rain drop sensor (vehicles equipped with the rain-sensing windshield wipers)
n
2-3. Operating the lights and windshield wipers
The sensor judges the amount of raindrops.
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