Chevrolet 1999 Camaro Owner's Manual page 37

On convertible models, the safety belt also locks if you
pull the belt very quickly out of the retractor.
CAUTION:
You can be seriously hurt if your shoulder belt is
too loose. In a crash, you would move forward
too much, which could increase injury. The
shoulder belt should fit against your body.
To unlatch the belt, just push the button on the buckle.
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