Lexus ES300 Owner's Manual page 50

SWITCHES
Raindrop detection type
" 1 Automatic control adjuster
To turn the wipers on, move the lever down until you reach
the desired speed setting.
The ignition switch must be in the "ON" position.
There are 3 settings:
"AUTO" position: Automatic operation
"LO" position: Low speed operation
"HI" position: High speed operation
36
Automatic operation
The wiper speed is determined by the amount of raindrops
and sunlight detected by the automatic wiper control
sensor.
Twist the automatic control adjuster in the "–" direction to
lower the sensitivity, and the "+" direction to boost the
sensitivity.
2 Washer on
The sensor is on the inside of the windshield as shown above.
Even if the wiper lever is in the "AUTO" position, the system will
switch to intermittent operations in the following conditions:
D When the windshield gets extremely cold (at less than
–10_C or 14_F)
D When the system malfunctions
However, when the windshield gets extremely hot (at more
than 90_C or 194_F), the wipers do not operate even if the
wiper lever is in the "AUTO" position.