2012 Toyota Sienna Owners Manual - Page 319

2-3. Operating the lights and wipers 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: Type A Off Rain-sensing wiper operation ("AUTO") Low speed operation High speed operation wiper wiper 2 When driving Temporary operation 285 SIENNA_U (OM45477U)