GMC 2007 Acadia - Manual (Page 17)

Do not have a seatback reclined if your vehicle
is moving.
Head Restraints
Adjust the head restraint so that the top of the
restraint is at the same height as the top of
the occupant’s head. This position reduces the
chance of a neck injury in a crash.
Pull the head restraint
up to raise it. To lower
the head restraint,
press the release
button, located on the
top of the seatback,
while you push the head
restraint down.
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