GMC 2010 Sierra - Manual (Page 103)

6. If 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 2‑49 for
more information.
7. 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.
Securing a Child Restraint in the
Center Front Seat Position
{ WARNING:
A child in a child restraint in the center front seat
can be badly injured or killed by the frontal
airbags if they inflate. Never secure a child
restraint in the center front seat. It is always better
to secure a child restraint in a rear seat.
Do not use child restraints in the center front seat
position.
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