GMC 2010 Sierra - Manual (Page 105)

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 2‑49 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 2‑49 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, if equipped,
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 4‑36.
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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