Toyota Prius c 2014 Owner's Manual page 88

1-4. Adjustable components (seats, mirrors, steering wheel)
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Releasing the seat belt
Release the rear center seat belt only when necessary, such as
when folding down the rear seat. For safety, always store the plate
in the designated place after releasing it.
STEP 1
A
86
B
B
A
To release tab "A", press the
release button.
To release tab "B", insert the
key (→P. 44) or tab "A" into the
hole on the buckle.
Retract the belt slowly when
releasing and stowing the seat
belt.