GMC 2015 Sierra Owner's Manual page 106

Crew and Double Cab Rear Seat
(Top Tether Anchor): Seating
positions with top tether anchors.
(Lower Anchor): Seating
positions with two lower anchors.
To assist in locating the lower
anchors on crew cab models, each
seating position with lower anchors
has two labels near the crease
between the seatback and the seat
cushion.
For double cab models, the rear
outboard seating positions have
exposed metal lower anchors in the
crease between the seatback and
the seat cushion.
For regular cab models, there is an
anchor symbol on the cover to
assist you in locating the top tether
anchors.
Do not install a child restraint in the
center seating position. See
Securing Child Restraints (Center
Front Seat) on page 3-57 or
Securing Child Restraints (Rear
Seat) on page 3-57 or Securing
Seats and Restraints
Child Restraints (Front Passenger
Seat) on page 3-61 for more
information.
Regular Cab
For regular cab models, the top
tether anchors are under covers on
the back panel behind the
passenger seat. Remove the trim
plug to access the anchor. Be sure
to use an anchor on the same side
of the vehicle as the seating
position where the child restraint will
be placed.
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