GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 57

Some child restraints that have a top tether are designed
for use with or without the top tether being attached.
Others require the top tether always to be attached.
In Canada, the law requires that forward-facing child
restraints have a top tether, and that the tether be
attached. Be sure to read and follow the instructions
for your child restraint.
If the child restraint does not have a top tether, one can
be obtained, in kit form, for many child restraints. Ask
the child restraint manufacturer whether or not a kit
is available.
Lower Anchor and Top Tether Anchor
Locations
Regular
Cab — Two-Passenger
Front Seat
Regular
Cab — Three-Passenger
Front Seat
Do not install a child restraint in the center front seat
position. See Securing a Child Restraint in the Center
Front Seat Position on page 1-61 for more information.
i
(Top Tether Anchor):
Seating positions with top
tether anchors.
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