Lexus IS250 2006 Owner's Manual page 91

When the child restraint system is not in use
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Leave the child restraint system properly secured on the seat. Do not store the
restraint loosely on a passenger seat or in the trunk.
Selecting an appropriate child restraint system
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Get an appropriate child restraint system for the child. If a child is too large for a
child restraint system, sit the child on a rear seat and use the vehicle's seat belt.
(P. 34)
1-7. Safety information
Convertible seat
Booster seat
1
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