GMC CHEVROLET Silverado 1500 2021 Owner's Manual page 59

58 Seats and Restraints
position on the seat, move the seat
rearward or recline the seat until the
shoulder belt retractor lock releases.
Engaging the child restraint locking
feature in the front outboard seating
position may affect the passenger
sensing system, if equipped. See
Passenger Sensing System 0 66.
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.
Pull up on the latch plate to make sure
it is secure. If the belt is not long
enough, see Seat Belt Extender 0 59.
Position the release button on the buckle
so that the seat belt could be quickly
unbuckled if necessary.
4. To make the lap part tight, pull up on
the shoulder belt.