GMC Sierra 2500 HD2022 Owner's Manual page 91

90 Seats and Restraints
In Canada, the law requires that
forward-facing child restraints have a top
tether, and that the tether be attached.
If the child restraint or vehicle seat position
does not have the LATCH system, you will
be using the seat belt to secure the child
restraint. Be sure to follow the instructions
that came with the child restraint.
If more than one child restraint needs to be
installed in the rear seat, be sure to read
Where to Put the Restraint 0 78.
Double Cab
1. Remove the head restraint or headrest
prior to installing a forward-facing child
restraint in an outboard rear seating
position. See Head Restraint or Headrest
Removal and Reinstallation under Lower
Anchors and Tethers for Children (LATCH
System) 0 79.
2. Put the child restraint on the seat.
3. Pick up the latch plate, and run the lap
and shoulder portions of the vehicle seat
belt through or around the child
restraint. The child restraint instructions
will show you how.
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.
The push button used to release the
latch plate must be visible and not
obscured by the child restraint. There
must not be direct contact of the child
restraint to the push button.
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.