GMC 1996 Sierra Owner's Manual page 48

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.
e
Tilt the latch plate to adjust the belt if needed. If the
shoulder belt goes in front of the child's face or neck,
put it behind the child restraint.
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