GMC 1998 Savana Van Owner's Manual page 75

Your vehicle has one
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.
If you ever lose your key, your dealer will be able to
assist you with obtaining a new one.
The bar-coded tag has a code on it that tells your dealer
or a qualified locksmith how to make an extra key. Keep
this tag in a safe place. If you lose your key, you'll be
able to have a new one made easily using this tag.
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