Hummer 2004 H2 - Manual (Page 12)

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.
Pull straight up on the head restraint to raise it and
push it down to lower it.
The front head restraints can also be tilted forward in
addition to being slid up or down. To tilt either of
the front head restraints do the following:
Pull the head restraint toward you until you hear a click.
Then let go. The head restraint will stay in this position
unless you pull it forward more until another click is
heard. There are four positions available: initial position,
first click, second click, and third click. After the third
position (three clicks) is reached, pulling the head
restraint farther will release it back to the normal upright
position.
The rear head restraints can be slid up or down just as
the front head restraints, but they do not tilt.
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