Oldsmobile 2000 Silhouette Owner's Manual page 68

When you sit in the center position bucket seat, you
have a lap safety belt which has a retractor.
1. Pick up the latch plate and, in a single motion, pull
the belt across you. Don't let it get twisted.
2. Push the latch plate into the buckle until it clicks.
If the belt stops before it reaches the buckle, let it go
back all the way and start again. Pull up on the latch
plate to make sure it is secure.
3. Feed the lap belt into the retractor to tighten it.
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4. Position and release it the same way as the lap part
-
of a lap shoulder belt.
If the belt isn't long enough, see "Safety Belt
Extender" at the end of this section. Make sure the
release button on the buckle is positioned so you
would be able to unbuckle the safety belt quickly if
you ever had to.