GMC 2010 Sierra Owner's Manual page 95

Regular Cab
Do not install a child restraint in the center seat position.
See Securing a Child Restraint in the Center Front Seat
Position on page 2 61 for more information.
For regular cab models, the top tether anchors are
located under covers on the back panel behind the
passenger seat. Remove the trim plug to access the
anchor. Be sure to use an anchor located on the same
side of the vehicle as the seating position where the
child restraint will be placed.
Crew Cab Shown, Extended Cab Similar
For crew and extended cab models, the top tether
anchors are the loops located near the top of the
seatback for each rear seating position. These loops
will be used to route the top tether through, as well as,
to secure the top tether in the vehicle. Be sure to use
an anchor (loop) located on the same side of the
vehicle as the seating position where the child restraint
will be placed.
Be sure to read the instructions following to properly
install a child restraint using these loops.
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