Chevrolet 2004 Aveo Owner's Manual page 69

One key is used for the
ignition, the door and all
other locks.
When a new vehicle is delivered, the dealer removes
the key tag and gives it to the first owner. The tag has a
code on it that tells your dealer how to make extra keys.
For vehicle security, keep the key tag in a safe place and
also record the key number somewhere other than inside
of the vehicle. If you lose your key, you will be able to
have a new one made easily using the tag.
Your vehicle may have an electronic immobilizer
designed to protect your car against theft. If so, only
keys with the correct electronic code can be used
to start the vehicle. Even if a key has the same profile,
it will not start the engine if the electronic code is
incorrect. If you need a new key, contact your dealer
who can obtain the correct key code. See Roadside
Assistance Program on page 7-6 for more information.
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.
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