1997 Chevrolet Astro Owner's Manual - Page 220

Hazard Warning Flashers The hazard warning flasher button is located on top of the steering column. Press the button down to make your front and rear turn signal lamps flash on and off. Your hazard warning flashers work no matter what position your key is in, and even if the key isn't in. To turn off the flashers, press the button down again. 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. your turn signals won't work. They also won't flash while you're braking. 5-2