GMC Yukon Denali 2014 Owner's Manual page 104

3-54 Seats and Restraints
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 third row seating positions,
with cinching latch plates, 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.
4. For passenger seating positions
with a lap-shoulder belt and a
free-falling latch plate, pull the
rest of the shoulder belt all the
way out of the retractor to set
the lock. When installing a child
restraint using a lap-shoulder
belt and a cinching latch plate,
skip Step 4 and proceed to
Step 5.