2004 Cadillac CTS Owner's Manual - Page 128

Hazard Warning Flashers The hazard warning button is located in the center of the instrument panel, between the two air vents. Your hazard warning flashers work no matter what position your key is in, and even if the key isn't in. Press the button to make the front and rear turn signal lamps flash on and off. The light in the center of the button will flash, indicating that the hazard warning flashers are on. Press the button again to turn the flashers off. Your hazard warning flashers let you warn others. They also let police know you have a problem. Your front and rear turn signal lamps will flash on and off. When the hazard warning flashers are on, neither your turn signals nor your Daytime Running Lamps (DRL) will work. 3-6