Pontiac G6 2010 Owner's Manual page 60

To unlatch the belt, push the button on the buckle.
The belt should return to its stowed position.
Slide the latch plate up the safety belt webbing when
the safety belt is not in use. The latch plate should rest
on the stitching on the safety belt, near the guide
loop on the side wall.
2-30
If the vehicle has a retractable hardtop, secure the
safety belt latch plate when the safety belt is not in
use in the rear seat. To do this, slide the safety
belt webbing (D) behind the belt webbing retaining
clip (B) and slide the latch (A) into the latch retaining
clip (C).
Before a door is closed, be sure the safety belt is out of
the way. If a door is slammed against a safety belt,
damage can occur to both the safety belt and the vehicle.