Lexus LS400 Owner's Manual page 41

SWITCHES
The time interval between sweeps is shortened when the vehicle
speed increases. When the vehicle speed reaches more than about
20 km/h (12 mph) with the interval adjuster in "F" position, the time
interval becomes the shortest 1.5 seconds.
If you stop the vehicle with the wiper switch in the "LO" position,
the wiper speed automatically changes from low speed to
intermittent operation speed.* This function does not work when the
interval adjuster is in the "F" position.
NOTE: *This feature can be set inoperative. Ask your Lexus
dealer for details.
For mist wiper operation (a single wipe), pull the lever toward
you and release it.
To make the washer squirt, push the button on the end of the
lever.
If the wiper lever is in the "OFF" position, the wipers will
automatically operate a couple of times and a few seconds later,
make a single wipe again to sweep the windshield completely.* The
last sweep does not happen if the vehicle speed exceeds about 170
km/h (106 mph).
NOTE: *The last single wipe can be set inoperative. Ask your
Lexus dealer for details.
The warning message "LOW WASHER FLUID" is displayed in the
multi information display when the fluid level in the tank becomes
nearly empty. For information on adding washer fluid, see "Adding
washer fluid" on page 261.
In cold weather, warm the windshield with the defroster before using
the washer. This will help prevent icing, which could block your
vision.
26
NOTICE
Do not operate the wipers if the windshield is dry. It may scratch
the glass.