GMC 2000 Sierra - Manual (Page 65)

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Securing a Child Restraint in a Rear
Outside Seat Position (Extended Cab)
There is limited space in the rear seating area of an
extended cab model. If you want to secure a child
restraint in a rear outside seating position, be sure to
study the instructions that came with your child
restraint to see if there is enough room to secure your
seat properly.
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. Put the restraint on the seat.
2. 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.
3. 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.