Toyota Sienna 2010 Owner's Manual page 190

2-3. Operating the lights and wipers
The windshield wipers and washer can be operated when
■
The engine switch is in the "ON" position.
If no windshield washer fluid sprays
■
Check that the washer nozzles are not blocked if there is washer fluid in the
windshield washer fluid reservoir.
NOTICE
When the windshield is dry
■
Do not use the wipers, as they may damage the windshield.
When there is no washer fluid spray from the nozzle
■
Damage to the washer fluid pump may be caused if the lever is pulled
toward you and held continually.
When a nozzle is blocked
■
Do not try to clear it with a pin or other object. The nozzle will be damaged.
192
Washer/wiper dual operation
Wipers operate automatically.