The Defoggers Can Be Operated When; The Outside Rear View Mirror Defoggers; When The Outside Rear View Mirror Defoggers Are On - Toyota 4RUNNER Owner's Manual

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The defoggers can be operated when

Vehicles without a smart key system:
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The engine switch is in the "ON" position.
Vehicles with a smart key system:
The "ENGINE START STOP" switch is in IGNITION ON mode.
The back window is completely closed.
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The outside rear view mirror defoggers

Turning the rear window defogger on will turn the outside rear view mirror
defoggers on.
CAUTION
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When the outside rear view mirror defoggers are on

Do not touch outside surface of the rear view mirrors, as they can become
very hot and burn you.
4RUNNER_U
3-1. Using the air conditioning system and defogger
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