Honda 1999 Odyssey Owner's Manual page 33

Protecting Children
3. After the belt has retracted, tug on
it. If the belt is locked, you will not
be able to pull it out. If you can pull
the belt out, it is not locked and
you will need to repeat these steps.
Driver and Passenger Safety
4. After confirming that the belt is
locked, grab the shoulder part of
the belt near the buckle and pull
up to remove any slack from the
lap part of the belt. Remember, if
the lap part of the belt is not tight,
the child scat will not be secure.
To remove slack, it may help to
put weight on the child seat, or
push on the back of the scat, while
pulling up on the belt.
5. Push and pull the child seat
forward and from side to side to
verify that it is secure enough to
stay upright during normal driving
maneuvers. If the child seat is not
secure, unlatch the belt, allow it to
retract fully, then repeat these
steps.