Hummer 2006 H2 - Manual (Page 11)

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 the head restraint up to raise it. Push the head
restraint down to lower it.
Each front head restraint can also be tilted forward to
four positions by pulling on it.
A click will sound after each tilt position is reached.
Pull the head restraint forward, past the last position, to
release it to the upright position.
The rear seat head restraints are also adjustable up and
down, but they do not tilt.
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