1994 Cadillac Seville Owner's Manual - Page 79

The squareignition keys isfor the ignition only. It has aresistor pellet which ispart of the vehicle's PASS Key I P system. The rounded door keys are for doors and all other locks. When anew Cadillac is delivered, the dealership removes the plugs from the doorkeys. Each plug has acode on it that tells the dealer or a qualified locksmith howto make extrakeys. However, the ignition keys do not have a knockout plug. The ignition keys have a bar code tag attached to them. Your dealer or qualified locksmith,by reading the bar code tag, can then make your ignition keys. There are15 alternative ignition PASS Key II@blanks to help discourage theft. Keep the bar code tag andthe doorkey plugs in a safe place. If you lose yourkeys, you willbe able to have newones made easily usingthe plug or bar code tag. 66