Lexus IS250 2006 Owner's Manual page 101

CAUTION
Do not use a seat belt extender
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If a seat belt extender is used when installing a child restraint system, the seat belt
will not securely hold the child restraint system, which could cause death or serious
injury to the child or other passengers in the event of a collision.
To correctly attach a child restraint system to the anchorages
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When using the lower anchorages, be sure that there are no foreign objects around
the anchorages and that the seat belt is not caught behind the child seat. Make sure
the child restraint system is securely attached, or it may cause death or serious
injury to the child in the event of a sudden stop or accident.
1-7. Safety information
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