Buick 2004 Rendezvous - Manual (Page 14)

Head Restraints Adjust your head restraint so that the top of the restraint
is closest to the top of your head. This position
reduces the chance of a neck injury in a crash.
The front seat head restraints are adjustable. Slide the
head restraint up or down to adjust it.
The rear seat head restraints in your vehicle may be
adjustable. They work the same as the front seat head
restraints.
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