Oldsmobile Silhouette Owner's Manual page 70

6. Select only one side of the harness. Place the harness
over the child's shoulder.
7. Push the latch plate (B) into the buckle until it clicks.
Be sure the buckle is free of any foreign objects that
may prevent you from securing the latch plates. If
you can't secure a latch plate, see your dealer for
service before using the child restraint.
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8. Place the other side of the harness over the
child's shoulder.
9. Push the latch plate into the buckle until it clicks.
10. Pull up on both latch plates to make sure they
are secure.
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