GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 73

If the vehicle does not have a rear seat that will
accommodate a rear-facing child restraint, a rear-facing
child restraint should not be installed in the vehicle,
even if the airbag is off.
If your child restraint has the LATCH system, see Lower
Anchors and Tethers for Children (LATCH) on page 1-49
for how and where to install your child restraint using
LATCH. If you secure a child restraint using a safety belt
and it uses a top tether, see Lower Anchors and Tethers
for Children (LATCH) on page 1-49 for top tether anchor
locations.
Do not secure a child seat in a position without a top
tether anchor if a national or local law requires that the
top tether be anchored, or if the instructions that come
with the child restraint say that the top strap must be
anchored.
In Canada, the law requires that forward-facing child
restraints have a top tether, and that the tether be
attached.
You will be using the lap-shoulder belt to secure the
child restraint in this position. Follow the instructions that
came with the child restraint.
1. Move the seat as far back as it will go before
securing the forward-facing child restraint.
When the passenger sensing system has turned off
the right front passenger frontal airbag, the off
indicator in the passenger airbag status indicator
should light and stay lit when you start the vehicle.
See Passenger Airbag Status Indicator on
page 3-40.
2. Put the child restraint on the seat.
3. Pick up the latch plate, and run the lap and shoulder
portions of the vehicle's safety belt through or
around the restraint. The child restraint instructions
will show you how.
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