Toyota 2012 Avalon Owner's Manual page 172

2-3. Operating the lights and windshield wipers
■
Raindrop detection 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.
190
Wash/wipe operation
Wipers will automatically oper-
ate a couple of times after the
washer squirts.
I n f o r ma t i o n P r o v i d e d b y :
Raindrop detection
wiper operation
Low speed wiper
operation
High speed wiper
operation
Temporary operation