GMC Yukon XL 2015 Owner's Manual page 89

3-22 Seats and Restraints
For front seating positions, if the
webbing locks in the latch plate
before it reaches the buckle, tilt
the latch plate flat to unlock.
3. Push the latch plate into the
buckle until it clicks. If you find
that the latch plate will not go
fully into the buckle, see if you
are using the correct buckle.
Pull up on the latch plate to
make sure it is secure. If the belt
is not long enough, see Safety
Belt Extender on page 3-27.
Position the release button on
the buckle so that the safety belt
could be quickly unbuckled if
necessary.
4. If equipped with a shoulder belt
height adjuster, move it to the
height that is right for you. See
Shoulder Belt Height Adjuster
in this section for instructions on
use and important safety
information.
5. To make the lap part tight, pull
up on the shoulder belt.
For third row seats, it may be
necessary to pull stitching on the
safety belt through the latch
plate to fully tighten the lap belt
on smaller occupants.