Yes go to your dealer with your key and wireless door lock fob
SOURCE: starter disabled due to theft system
the wire that goes to the ignition to the anti theft device is probably broken if you call a good locksmith they can go in through the steering column and fix it same thing happened to my 95 eldorado apparently cadillac designed the anti theft system to coincide with the ignition and is connected to the ignition with two wires that turn as the key is turned the wires twist and eventually they wear out
SOURCE: how to reset a 1990 cadillac el dorado security
Not sure if it will work for this car, but turn the key to the ON position, and leave it like that for 10 - 15 minutes. I know thats how some GM cars are reset. If you have a weak battery be sure to hook a charger up to it while doing this.
SOURCE: How to reset theft problem system on 1999 Cadillac el dorado
use your key fob to unlock the doors then try your key,if you dont have a fob,call your dealer
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