GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 71

6. To tighten the belt, push down on the child restraint,
pull the shoulder portion of the belt to tighten the lap
portion of the belt and feed the shoulder belt back
into the retractor. When installing a forward-facing
child restraint, it may be helpful to use your knee
to push down on the child restraint as you tighten
the belt.
7. If your vehicle does not have a rear seat and your
child restraint has a top tether, follow the child
restraint manufacturer's instructions regarding the
use of the top tether. See Lower Anchors and
Tethers for Children (LATCH) on page 1-49.
8. Push and pull the child restraint in different
directions to be sure it is secure.
To remove the child restraint, unbuckle the vehicle safety
belt and let it return to the stowed position. If the top
tether is attached to a top tether anchor, disconnect it.
If you turned the airbag off with the switch, turn on the
right front passenger airbag when you remove the child
restraint from the vehicle unless the person who will be
sitting there is a member of a passenger airbag risk
group. See Airbag Off Switch on page 1-81.
1-65