Two problems related to air bag light on have been reported for the 1998 Cadillac Deville. The most recently reported issues are listed below.
Takata recall. Air bag light is on a few days ago. Also, vehicle overheated and needed new water pump several years ago. Keep having to replace the battery. Smoke was coming up from front and turn signals did not work. Had to replace fall 2016 horn did not work, had to replace part inside steering wheel. Jan 2017.
Upon starting vehicle by placing the key in the ignition, passenger's side door mounted air bag deployed without any cause. Also, a week following the air bag deploying, air bag indicator light was flashing on the dashboard. Consumer has contacted the dealer, dealer has disconnected the passenger's side mounted air bag. Manufacturer contacted. Repairs made.