Pontiac Solstice 2010 Owner's Manual page 50

4. To make the lap part tight, pull up on the
shoulder belt.
It may be necessary to pull stitching on the safety
belt through the latch plate to fully tighten the
lap belt on smaller occupants.
2-20
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.
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.