Hummer 2008 H3 Owner's Manual page 29

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.
To unlatch the belt, just push the button on the buckle.
When the safety belt is not in use, slide the latch
plate up the safety belt webbing. The latch plate should
rest on the stitching on the safety belt, near the guide
loop on the side wall.
Before you close a door, be sure the belt is out of
the way. If you slam the door on it, you can damage
both the belt and your vehicle.
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