Chevrolet 1998 Lumina Owner's Manual page 50

8. Move the harness up or down to the correct slot. The
correct slot is the one that will be at or just above the
top of the child's shoulder.
9.
10.
Twist the harness slightly to route it through the
correct slot.
Pull on the harness. Make sure it is properly routed
and isn't twisted or flipped over.
11. Repeat Steps 5 through 10 for the other side of
the harness. Be sure both sides are adjusted to the
same height.
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