TOYOTA 2012 Avalon - Manual (Page 218)

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3-1. Using the air conditioning system and defogger
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Operating conditions
Vehicles with smart key system
The “ENGINE START STOP” switch must be in IGNITION ON mode.
Vehicles without smart key system
The engine switch must be in the “ON” position.
CAUTION
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When the outside rear view mirror defoggers are on
Do not touch the rear view mirror surfaces, as they can become very hot and
burn you.
NOTICE
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To prevent battery discharge
Turn the defoggers off when the engine is not running.