Pontiac 2005 Montana Owner's Manual page 81

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.
9. Push the latch plate into the buckle until it clicks.
10. Pull up on the latch plates to make sure they
are secure.
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