GMC 2015 Yukon XL Denali Owner's Manual page 120

7. Before placing a child in the
child restraint, make sure it is
securely held in place. To check,
grasp the child restraint at the
safety belt path and attempt to
move it side to side and back
and forth. When the child
restraint is properly installed,
there should be no more than
2.5 cm (1 in) of movement.
If the airbag is off, the off indicator in
the passenger airbag status
indicator will come on and stay on
when the vehicle is started.
If a child restraint has been installed
and the on indicator is lit, see If the
On Indicator is Lit for a Child
Restraint under Passenger Sensing
System on page 3-33 for more
information.
To remove the child restraint,
unbuckle the vehicle safety belt and
let it return to the stowed position.
Seats and Restraints 3-61