Pontiac 2006 G6 Owner's Manual page 32

CAUTION:
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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, push the button on the buckle.
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If your vehicle has a retractable hardtop, secure the
safety belt latch plate when the hardtop is down and the
safety belt is not in use. To do this, slide the safety
belt webbing (D) behind the belt webbing retaining
clip (B) and slide the latch (A) into the latch retainting
clip (C).