Toyota 2008 Prius Quick Reference Manual page 103

1-4. Adjustable components (seats, mirrors, steering wheel)
n To prevent sensor error (vehicles with auto anti-glare inside rear view
mirror)
CAUTION
n While driving
Do not adjust the position of the mirror while driving.
Doing so may lead to mishandling of the vehicle and an accident, or result-
ing in death or serious injury.
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PRIUS_U_(L/O_0802)
To ensure correct functioning of the sen-
sors, do not touch or cover the sensors.