TOYOTA 2012 Tacoma - Manual (Page 48)

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1-3. Adjustable components (seats, mirrors, steering wheel)
Adjusting the height of rear view mirror
Adjust the height of the rear view
mirror by moving it up and down.
Auto anti-glare inside rear view mirror (type B)
In automatic mode, sensors are used to detect the headlights of
vehicles behind and automatically reduces the reflected light.
Turns automatic mode on/off
The indicator comes on when
automatic mode is turned on.
The mirror will revert to the
automatic mode each time the
engine switch is turned on.