TOYOTA 2010 Yaris - Manual (Page 72)

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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 rear seat.
To release the hooked end tab,
insert the vehicle’s key into the
hole on the buckle.
Stow the seat belt tabs in the
cover set in the roof as shown.