1992 Cadillac EL Dorado Theft System

At the base of the column, there is a large connector. Coming out of the column is a couple small white wires in an orange conduit. With the key in the ignition, and the connector disconnected, check the resistance of the white wires. There should be something there at all key positions, other than open circuit. Ideally, it will be the same resistance as the key pellet. If it is open at any time, you have a failed ignition lock cylinder. You can either bridge the connector with a resistor pack of the key value, or replace the lock cylinder and keys. You will need keys if you replace the lock cylinder, because it cannot be coded. The thing to remember, is there are 15 possibilities of key value, so yours needs to be determined at an exact replacement obtained. A dealer can interrogate the key, or a locksmith. Someone with some experience in the system might be able to relate a resistance value to the correct VATS key code as well.