GMC 2018 Acadia Denali Owner's Manual page 105

104 Seats and Restraints
7. Before placing a child in the
child restraint, make sure it is
securely held in place. Refer to
your child restraint
manufacturer instructions.
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 0 79.
To remove the child restraint,
unbuckle the vehicle seat belt and
let it return to the stowed position.