Toyota 2009 Tundra Owner's Manual page 91

1-3. Adjustable components (seats, mirrors, steering wheel)
Raising the bottom cushion (Double Cab models)
Before raising the bottom cushion
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Raising the bottom cushion
n
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Stow the seat belt buckles.
This prevents the seat belt buck-
les from falling out when you fold
the seatback.
Pass the seat belts through the
seat belt hangers.
This prevents the shoulder belt
from being damaged.
Make sure that the seat belts are
removed from the hangers before
using them.
Raise the bottom cushion up
while pulling the lever until it
locks.
When returning bottom cushion to
its original position, push the bot-
tom cushion down while pulling
the lever until it locks.