Chevrolet 2004 Venture Owner's Manual page 92

6. Select only one side of the harness. Place the
harness over the child's shoulder.
7. Push the latch plate (B) into the buckle until
it clicks.
Be sure the buckle is free of any foreign objects
that may prevent you from securing the latch plates.
If you can not secure a latch plate, see your
dealer for service before using the child restraint.
8. Place the other side of the harness over the child's
shoulder.
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9. Push the latch plate into the buckle until it clicks.
10. Pull up on the latch plates to make sure they are
secure.