Toyota PRIUS ALPHA 2012 Quick Reference Manual page 274

2-3. Operating the lights and windshield wipers
■
The windshield wipers and washer can be operated when
The "POWER" switch is in ON mode.
■
If no windshield washer fluid sprays
Check that the washer nozzles are not blocked if there is washer fluid in the
washer fluid tank.
260
Increases the intermittent
windshield wiper frequency
(if equipped)
Decreases the intermittent
windshield wiper frequency
(if equipped)
Washer/wiper dual opera-
tion
The wipers will automatically
operate a couple of times after
the washer squirts.
If the headlights are on, the
headlight cleaner will operate
once.