Cadillac 2010 DTS Owner's Manual page 59

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, 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 near the guide loop on the side wall.
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 belt and the vehicle.
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