2011 Toyota Avalon Owners Manual - Page 250

3-1. Using the air conditioning system and defogger n 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 n 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 n To prevent battery discharge Turn the defoggers off when the engine is not running. 226 AVALON_U (OM41428U)