GMC Canyon 2016 Owner's Manual page 82

3.3. Route the top tether
according to your child
restraint instructions and
the following instructions:
If the position you are
using does not have a
head restraint and you are
using a single tether, route
the tether over the
seatback.
If the position you are
using has a fixed head
restraint and you are
using a single tether, route
the tether around the
inboard or outboard side
of the head restraint.
Seats and Restraints
If the position you are
using does not have a
head restraint and you are
using a dual tether, route
the tether over the
seatback.
If the position you are
using has a fixed head
restraint and you are
using a dual tether, route
the tether around the
sides of the head restraint.
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