Chevrolet 2000 Lumina Owner's Manual page 58

D
If your vehicle doesn't have the child restraint
locking feature on the shoulder belt retractor,
tighten the belt by pulling up on the shoulder belt
while you push down on the child restraint. If
you're using a forward
may find it helpful to use your knee to push down
on the child restraint as you tighten the belt.
6. Push and pull the child restraint in different
directions to be sure it is secure.
To remove the child restraint, just unbuckle the vehicle's
safety belt and let it go back all the way. The safety belt
will move freely again and be ready to work for an adult
or larger child passenger.
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facing child restraint you
Securing a Child Restraint in the Center
Rear Seat Position
You'll be using the lap belt. Be sure to follow the
instructions that came with the child restraint. Secure
the child in the child restraint when and as the
instructions say.