One problem related to anti-theft controller has been reported for the 1998 Cadillac Deville. The most recently reported issues are listed below.
According to a local Cadillac dealers service manager-the ignition has a theft deterent system that has a wire that often comes loose causing the vehicle to be unstartable and thus leaves the driver stranded. The service manager tells me that he has done several of these and doesnt know why there is no recall.