Toyota Avalon Hybrid 2018 Owner's Manual page 195

Rain-sensing windshield wipers (if equipped)
With "AUTO" 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.
Rain-sensing windshield
1
wiper operation
Low speed windshield
2
wiper operation
High speed windshield
3
wiper operation
Temporary operation
4
When "AUTO" is selected, the sensor sensitivity can be adjusted as
follows by turning the switch ring.
Increases the sensitivity
5
Decreases the sensitivity
6
Washer/wiper dual operation
7
Wipers will automatically operate a
couple of times after the washer
squirts.
4-3. Operating the lights and wipers
195
4