Hummer 2003 H2 Owner's Manual page 87

If you ever lose a key, your dealer will be able to assist
you with obtaining replacements.
Your vehicle has a
-
double sided key for the
ignition and all door locks.
NOTICE:
Your vehicle has a number of new features that
can help prevent theft. But you can have a lot of
trouble getting into your vehicle if you ever lock
your key inside. You may even have to damage
your vehicle to get in. So be sure you have an
extra key.
In an emergency, contact roadside assistance.
See "Roadside Assistance" in the Index for more
information. If your vehicle is equipped with the
R
OnStar system with an active subscription and you
lock your keys inside the vehicle, OnStar may be able to
send a command to unlock your vehicle. See "OnStar"
in the Index for more information.
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