GMC 2013 Sierra Owner's Manual page 117

2. Pick up the latch plate, and run
the lap and shoulder portions of
the vehicle's safety belt through
or around the restraint. The child
restraint instructions will show
you how.
For crew cab second row
seatings positions, tilt the latch
plate to adjust the belt if needed.
3. Push the latch plate into the
buckle until it clicks.
Position the release button on
the buckle so that the safety belt
could be quickly unbuckled if
necessary.
I n f o r ma t i o n P r o v i d e d b y :
Seats and Restraints
4. Pull the shoulder belt all the way
out of the retractor to set the
lock. When the retractor lock is
set, the belt can be tightened but
not pulled out of the retractor.
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