GMC SIERRA DENALI 2002 Manual page 78

If you ever lose your key, your dealer will be able to
assist you with obtaining replacements.
Your vehicle has one
-
double sided key for the
ignition and all door locks.
Your vehicle also has a key
that locks and unlocks only
the center floor console.
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.
If you ever do get locked out of your vehicle, call the
GM Roadside Assistance Center. See "Roadside
Assistance" in the Index.
If your vehicle is equipped with the 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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