Chevrolet Malibu 2007 Malibu Owner's Manual page 98

When a new vehicle is delivered, the key has a
bar-coded key tag. This tag may be removed
by your dealer before it is delivered.
98
One key is used for the
ignition and all locks.
Each tag has a key code on it that tells your
dealer or a qualified locksmith how to make extra
keys. Keep the tag in a safe place. If you lose
your keys, you'll be able to have one made easily
using this tag. If you need a new key, go to
your dealer for the correct key code. See Roadside
Assistance Program on page 484 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.