Lexus RX 450h 2012 Owner's Manual page 232

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Rain-sensing windshield wipers (if equipped)
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:
Type A
2-3. Operating the lights and windshield wipers
Off
Rain-sensing
operation
Low
operation
High speed wiper
operation
Temporary operation
wiper
speed wiper
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