Buick lucerne 2009 Owner's Manual page 32

4. If equipped with a shoulder belt height adjuster,
move it to the height that is right for you. See
"Shoulder Belt Height Adjustment" later in this
section for instructions on use and important
safety information.
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.
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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.