GMC 2010 Canyon Crew Cab Owner's Manual page 56

5. 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.
2-28
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.
Before a door is closed, be sure the belt is out of the
way. If a door is slammed against a safety belt, damage
can occur to both the belt and the vehicle.