1996 Cadillac Seville Owner's Manual - Page 61

The square key is for the ignition only. It has a resistor pellet which is part of the vehicle's PASS-Key@II system. dealer removes When a new Cadillac is delivered, the the plug from the door key. The plug hasa code on it that tells the dealer or a qualified locksmith how to make extra keys. The ignition key has a bar code tag attached to it rather thana knock out plug. Your dealer or qualified locksmith can make extra ignition keysby reading the bar code tag. There are 15 alternative ignition PASS-Key I1 blanks to help discourage theft. Keep the bar code tag and the door key plugs in a safe place.If you lose your keys, you will be able to have new ones made using the plug or bar code tag. The oval key is the for doors and all other locks. NOTICE: Your Cadillac has a number of new features that can help prevent theft. You can have a lot of trouble getting intoyour vehicle ifyou ever lock your keys inside and you may have to damage your vehicle to get in. Be sure you have extra keys.