TOYOTA 2011 Sienna - Manual (Page 171)

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1-3. Adjustable components (seats, mirrors, steering wheel)
■ Release method
The belt can be completely released when not required, such as
when folding down the third seat.
Insert the key into the hole on
the center seat belt buckle to
release the tab (with the hooked
end), and allow the belt to
retract.
Stow the seat belt tabs in the
cover set in the roof as shown.
■ Extracting the belt
Pull tab out and pull the belt
out a little. Then pull tab out.
STEP 1
STEP 2