2009 GMC Envoy Owner's Manual - Page 138

Hazard Warning Flashers (Hazard Warning Flasher): Press this button located on top of the steering column, to make the front and rear turn signal lamps flash on and off. This warns others that you are having trouble. Press again to turn the flashers off. When the hazard warning flashers are on, the vehicle's turn signals will not work. Tilt Wheel The tilt lever is on the outboard side of the steering column, under the turn signal lever. | Horn To sound the horn, press the horn symbols on the steering wheel pad. Hold the steering wheel and pull the lever toward you to change the position, then release the lever to lock. Do not adjust the steering wheel while driving. 3-6