Lexus LS 600h L 2012 Owner's Manual page 163

1-8. Safety information
When installing a child restraint system on a rear outboard seat (power rear seat
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only)
Selecting an appropriate child restraint system
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Use a child restraint system appropriate for the child until the child becomes
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large enough to properly wear the vehicle' s seat belt.
If the child is too large for a child restraint system, sit the child on a rear seat and
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use the vehicle' s seat belt. (→P. 109)
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When using a child restraint system in a rear
outboard seat, adjust the following:
The upper seatback to the rearmost posi-
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tion
Relaxation seat: The seatback to the most
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upright position
The seat cushion to the fully rearward
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position
The head restraint to the lowest and
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rearmost position