TOYOTA 2011 Tundra - Manual (Page 102)

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1-3. Adjustable components (seats, mirrors, steering wheel)
1
Before driving
n Adjusting the height of the belt
Front seats (Double Cab and CrewMax models)
Down
Push the lock release button
and slide the height adjuster
down.
Up
Move the height adjuster up as
needed until you hear a click.