TOYOTA 2011 Avalon - Manual (Page 249)

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3-1. Using the air conditioning system and defogger
3
Interior features
AVALON_U (OM41428U)
Rear window and outside rear view mirror defoggers
These features are used to defog the rear window, and to remove
raindrops, dew and frost from the outside rear view mirrors.
Press the button to turn on the
rear window and outside rear
view mirror defoggers. The
defoggers will automatically
turn off after approximately 15
minutes. Pressing the button
again also turns the defoggers
off.
The operation time changes
according to the ambient tem-
perature and vehicle speed.