2012 Lexus HS 250h Owners Manual - Page 206

2-3. Operating the lights and windshield wipers Washer/wiper dual operation The wipers will automatically operate a couple of times after the washer squirts. If the headlights are on, the headlight cleaners will operate once. (→P. 211) When is selected, the wipers will operate automatically when the sensor detects falling rain. The system automatically adjusts wiper timing in accordance with rain volume and vehicle speed. When is selected, the sensor sensitivity can be adjusted as follows by turning the switch ring: Rain-sensing wiper operation Low speed wiper operation High speed wiper operation Temporary operation 206