Lexus LS460 2011 Owner's Manual page 242

2-3. Operating the lights and windshield wipers

Raindrop sensor

If the wiper switch is turned to "AUTO" position while the "ENGINE
START STOP" switch is in IGNITION ON mode, the wiper will operate
once to show that auto mode is activated.

If the temperature of the raindrop sensor is 90C (194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".

If no windshield washer fluid sprays
Check that the washer nozzles are not blocked and if there is washer fluid in
the windshield washer fluid reservoir.
CAUTION

Caution regarding the use of windshield wipers in "AUTO" mode
The windshield wipers may operate unexpectedly if the sensor is touched or
the windshield is subject to vibration in "AUTO" mode. Take care that your
fingers or anything else do not become caught in the windshield wipers.
NOTICE

When the windshield is dry
Do not use the wipers, as they may damage the windshield.

When the washer fluid tank is empty
Damage to the washer fluid pump may be caused if lever is pulled toward
you and held continually.
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LS460_EE

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 intermit-
tently strikes the windshield, or if bugs
etc. are present on the windshield.