Buick LESABRE 1996 Manual page 58

The ignition keys are
for the ignition only.
The door keys are for the
doors and all other locks.
When a new LeSabre is delivered, the dealer removes
the plugs from the keys, and gives them to the first
owner. However, the ignition key may not have a plug.
If the ignition key doesn't have a plug, it will have a
bar-coded key tag.
Each plug or tag has a code on it that tells your dealer or
a qualified locksmith how to make extra keys. Keep the
plugs or the tags in a safe place. If you lose your keys,
you'll be able to have new ones made easily using these
plugs or the tag. If your ignition keys don't have plugs
or the tag, go to your Buick dealer for the correct key
code if you need a new ignition key.
I
NOTICE:
Your Buick has a number of features that can help
prevent theft. But you can have a lot of trouble
getting into your vehicle if you ever lock your keys
inside. You may even have to damage your vehicle
to get in. So be sure you have extra keys.
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