Chevrolet VENTURE 1999 Owner's Manual page 85

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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. 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.
Third Row Outside Seats
If you are using a child restraint in a third row
outside seat position, 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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