Toyota 2012 Prius Owner's Manual page 328

2-3. Operating the lights and windshield wipers
Windshield wipers and washer
When intermittent windshield wiper operation is selected, wiper
intervals can be also adjusted.
The wiper operation is selected by moving the lever as follows.
Type A
300
PRIUS PHV_OM_OM47818U_(U)
Intermittent
shield wiper opera-
tion
Low speed
shield wiper opera-
tion
High speed
shield wiper opera-
tion
Temporary operation
Increases the intermittent
windshield wiper frequency
(if equipped)
Decreases the intermittent
windshield wiper frequency
(if equipped)
wind-
wind-
wind-