GMC 1996 Sierra Owner's Manual page 54

Front (All)
5. Buckle the belt. Make sure the release button is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.
6. To tighten the belt, pull
its free
end while you push
down on the child restraint.
7. Push and pull the child restraint in different
directions to be sure
it
is secure. If it isn't, secure
the restraint in a different place in the vehicle and
contact the child restraint maker for their advice
about how to attach the child restraint properly.
To remove the child restraint, just unbuckle the vehicle's
safety belt. It will be ready
to
work for an adult or larger
child passenger.
Securing a Child Restraint in the Right
Front Seat Position
1-46