Toyota Avalon Operating Manual page 159

Rain-sensing windshield wipers (if equipped)
Type A
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.
1
Rain-sensing
wiper operation
2
Low speed wiper
operation
3
High speed wiper
operation
4
Temporary operation
5
Increases the sensitivity
6
Decreases the sensitivity
AVALON (U)_(OM41440U)
4-3. Operating the lights and wipers
181
4