2008 GMC Envoy Owner's Manual - Page 140

Hazard Warning Flashers The hazard warning flashers warn others. They also let the police and other emergency vehicles know you have a problem. The hazard warning flasher button is located on top of the steering column. Horn To sound the horn, press the horn symbols on the steering wheel pad. Tilt Wheel The tilt lever is on the outboard side of the steering column, under the turn signal lever. Press the button to make the front and rear turn signal lamps flash on and off. Press the button again to turn the flashers off. The hazard warning flashers work no matter what ignition position the key is in, and even if the key is not in the ignition. When the hazard warning flashers are on, your vehicle's turn signals will not work. Do not adjust the steering wheel while driving. Hold the steering wheel and pull the lever toward you to change the position, then release the lever to lock. Other Warning Devices If you carry reflective triangles, you can set them up at the side of the road about 300 feet (100 m) behind your vehicle. 3-6