GMC 2010 Sierra - Manual (Page 91)

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.
Wherever a child restraint is installed, be sure to secure
the child restraint properly.
Keep in mind that an unsecured child restraint can
move around in a collision or sudden stop and injure
people in the vehicle. Be sure to properly secure any
child restraint in your vehicle — even when no child is
in it.
Lower Anchors and Tethers for
Children (LATCH)
The LATCH system holds a child restraint during
driving or in a crash. This system is designed to make
installation of a child restraint easier. The LATCH
system uses anchors in the vehicle and attachments on
the child restraint that are made for use with the LATCH
system.
Make sure that a LATCH-compatible child restraint is
properly installed using the anchors, or use the vehicle's
safety belts to secure the restraint, following the
instructions that came with that restraint, and also the
instructions in this manual. When installing a child
restraint with a top tether, you must also use either the
lower anchors or the safety belts to properly secure the
child restraint. A child restraint must never be installed
using only the top tether and anchor.
In order to use the LATCH system in your vehicle, you
need a child restraint that has LATCH attachments.
The child restraint manufacturer will provide you with
instructions on how to use the child restraint and its
attachments. The following explains how to attach a
child restraint with these attachments in your vehicle.
Not all vehicle seating positions or child restraints have
lower anchors and attachments or top tether anchors
and attachments.
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