TOYOTA 2011 Yaris Sedan - Manual (Page 52)

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1-3. Adjustable components (seats, mirrors, steering wheel)
Rear seats (split rear seats only)
The seatbacks of the rear seats can be folded down.
Insert the key into the hole on
the center seat belt buckle to
release tab (with hooked end),
and allow the belt to retract.
Remove the seat belts from
the seat belt guides.
Check that the security lock
levers in the trunk are in
unlock position.