GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 75

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 the vehicle does not have a rear seat and the
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 for more
information.
8. Push and pull the child restraint in different
directions to be sure it is secure.
If the airbag is off, the off indicator in the passenger
airbag status indicator will come on and stay on when
the vehicle is started.
If a child restraint has been installed and the on indicator
is lit, see "If the On Indicator is Lit for a Child Restraint "
under Passenger Sensing System on page 1-84 for more
information.
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.
1-69