2011 Toyota Sienna Owners Manual - Page 359

2-3. Operating the lights and wipers Washer/wiper dual operation The wipers will automatically operate a couple of times after the washer squirts. Rain-sensing windshield wipers (if equipped) When "AUTO" is selected, the wipers will operate automatically when the sensor detects falling rain. The system automatically adjusts wiper timing in accordance with rain volume. When "AUTO" is selected, the sensor sensitivity can be adjusted as follows by turning the switch ring: Rain-sensing wiper operation ("AUTO") Low speed wiper operation High speed wiper operation Temporary operation 266