2011 Toyota Sienna Owners Manual - Page 358

2-3. Operating the lights and wipers Windshield wipers and washer Intermittent windshield wipers with interval adjuster The wiper operation is selected by moving the lever as follows. When intermittent windshield wiper operation is selected, the wiper interval can be also adjusted. Intermittent windshield wiper operation Low speed windshield wiper operation High speed windshield wiper operation Temporary operation 2 When driving Increases the intermittent windshield wiper frequency Decreases the intermittent windshield wiper frequency 265