1996 GMC Sonoma Owner's Manual - Page 187

Section 5 Problems on the Road Here you'll find what to do about some problems that can occur on the road. Hazard Warning Flashers 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. Press the button on top of the steering column all the way 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 until the first click and release. 5-1