TOYOTA 2011 Sienna - Manual (Page 317)

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2-3. Operating the lights and wipers
Washer/wiper dual opera-
tion
The wipers will automatically
operate a couple of times after
the washer squirts.
Rain-sensing windshield wipers (if equipped)
When “AUTO” is selected, the wipers will operate automatically
when the sensor detects falling rain. The system automatically
adjusts wiper timing in accordance with rain volume.
When “AUTO” is selected, the sensor sensitivity can be adjusted
as follows by turning the switch ring:
Rain-sensing wiper opera-
tion (“AUTO”)
Low speed wiper operation
High speed wiper operation
Temporary operation