Toyota FJ CRUISER Owner's Manual page 83

1-3. Adjustable components (seats, mirrors, steering wheel)
Auto anti-glare inside rear view mirror
In automatic mode, sensors are used to detect the headlights of
vehicles behind and automatically reduces the reflected light.
Adjusting the height of rear view mirror
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FJCRUISER_OM_General_OM35B53W
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 to the
ON position.
Adjust the height of the rear view
mirror by moving it up and down.