Service manual

I
The square keys are
for the ignition only.
The round keys are for
the doors and all other
locks.
When a new Cadillac
is delivered, the dealer
removes the plugs
from the keys, and
gives them to the first
owner.
Each plug has a code on it that tells your dealer or a qualified locksmith
how to make extra keys. Keep the plugs in a safe place.
If you lose your
keys, you'll be able to have new ones made easily using these plugs. If
your ignition keys don't have plugs, go to your Cadillac dealer for the
~- correct key code if you need a new ignition key.