GMC 2004 Savana Van Owner's Manual page 89

When a new vehicle is delivered, the dealer provides
the owner with a pair of identical keys and a
bar-coded tag.
This vehicle has one
double-sided key for the
ignition and door locks. It
will fit with either side up.
The bar-coded tag has a code on it that tells your
dealer or a qualified locksmith how to make extra keys.
Keep this tag in a safe place. If you lose your keys,
you'll be able to have new ones made easily using
this tag.
Notice: If you ever lock your keys in your vehicle,
you may have to damage the vehicle to get in.
Be sure you have spare keys.
If you ever do get locked out of your vehicle, call GM
Roadside Assistance Center. See Roadside Assistance
Program on page 7-6.
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