Oldsmobile 2004 Silhouette Owner's Manual page 48

To unlatch the belt, just push the button on the buckle.
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Rear Safety Belt Comfort Guides for
Children and Small Adults
Rear safety belt comfort guides provide added safety
belt comfort for older children who have outgrown
booster seats and for smaller adults. When installed on
a shoulder belt, the comfort guide better positions
the belt away from the neck and head.
If your vehicle has a split bench seat in the third row,
there is one guide for each outside passenger position.
To provide added safety belt comfort for children
who have outgrown child restraints and booster seats
and for smaller adults, the comfort guides may be
installed on the shoulder belts. Here is how to install a
comfort guide and use the safety belt: