Cadillac XT6 2023 Owner's Manual page 107

106 Seats and Restraints
Tilt the latch plate to
adjust the belt if needed.
4. Push the latch plate into
the buckle until it clicks.
Position the release button
on the buckle, away from
the child restraint, so that
the seat belt could be
quickly unbuckled if
necessary.
5. 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.
6. To tighten the belt, push
down on the child restraint,
pull the shoulder portion of
the belt to tighten the lap
portion of the belt, and
feed the shoulder belt
back into the retractor.
There must be finger
clearance between the
push button and the child
restraint. If there is not
clearance between the
buckle push button and the
child restraint, move the
seat upward and repeat