Pontiac 2005 Montana Owner's Manual page 80

4. Before placing the child in the child restraint, add
slack to the shoulder harness. Pull the black
shoulder harness release strap firmly. At the same
time pull both shoulder harness straps through
the slots in the seatback as shown.
5. Place the child on the child restraint cushion.
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6. Select only one side of the harness. Place the
harness over the child's shoulder.