GMC SIERRA 2002 Manual page 74

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You'll be using the lap shoulder belt. See the earlier part
about the top strap if the child restraint has one. Be sure
to follow the instructions that came with the child
restraint. Secure the child in the child restraint when and
as the instructions say.
1. Your vehicle has a right front passenger's air bag. If
your vehicle is a regular cab or an extended cab and
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you are using a rear facing child restraint in this seat,
make sure the air bag is turned off. See "Air Bag Off
Switch" in the Index. If your child restraint is
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forward facing, always move the seat as far back as
it will go before securing it in this seat. See "Seats"
in the Index.
2. Put the restraint on the seat.
3. Pick up the latch plate, and run the lap and shoulder
portions of the vehicle's safety belt through or
around the restraint. The child restraint instructions
will show you how.
If the shoulder belt goes in front of the child's face or
neck, put it behind the child restraint.
4. Buckle the belt. Make sure the release button is
positioned so you would be able to unbuckle the
safety belt quickly if you ever had to.
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