1994 GMC Safari Owner's Manual - Page 186

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 and off. But they won'tflash if you're braking. Press the button in to make yourfront and un rear t r signal lights flash on andoff. Your flashers workno matter what position your key is in, and even if the key isn't in. To turn off the flashers, pull out on the collar. When the hazard warning flashers are on, your turn signals won't work. 5-2