Toyota 2012 Highlander Owner's Manual page 76

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To prevent sensor error (vehicles with auto anti-glare inside rear view
mirror)
CAUTION
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Caution while driving
Do not adjust the position of the mirror while driving.
Doing so may lead to mishandling of the vehicle and an accident, resulting in
death or serious injury.
1-3. Adjustable components (seats, mirrors, steering wheel)
To ensure that the sensors operate prop-
erly, do not touch or cover them.
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