1993 Cadillac DeVille Owner's Manual - Page 238

_HAZARD W M I N G FLASHERS ' / .. Your hazard warning flashers let you warn others. They also let police know you have a problem. Your front and rear turn signal lights will flash on andoff. Press the buttonin to make your front and rear turnsignal lights flash on andoff. I Your hazard warning flashers work no matter what position your key is in, and even if the key isn't in.