2009 GMC Envoy Owner's Manual - Page 140

If the vehicle has a trailer towing option with added wiring for the trailer lamps, a turn signal flasher is used. With this flasher installed, the signal indicator flashes even if a turn signal bulb is burned out. Check the front and rear turn signal lamps regularly to make sure they are working. Flash-to-Pass This feature lets high-beam headlamps be used to signal to a driver in front of you that you want to pass. It works even if the headlamps are in the automatic position. To use it, pull the turn signal lever toward you, then release it. If the headlamps are in the automatic position or on low beam, the high-beam headlamps turn on. They will stay on as long as the lever is held toward you. The high-beam indicator on the instrument panel cluster comes on. Release the lever to return to normal operation. Turn Signal On Chime A chime sounds if the turn signal has been on 3/4 of a mile (1.2 km). Move the turn signal lever to off. Headlamp High/Low-Beam Changer To change the headlamps from low to high beam, push the lever toward the instrument panel. To return to low-beam headlamps, pull the multifunction lever toward you. Then release it. When the high beams are on, this indicator light on the instrument panel cluster will also be on. Windshield Wipers 8 (Mist): Turn the band to mist, for a single wiping cycle. Hold it there until the wipers start, then release it. The wipers will stop after one wipe. Hold the band on mist longer if more wipe cycles are needed. 9 (Off): Turns the wipers off. N (Windshield Wipers): Turn the band to control the windshield wipers. 6: Turn the band to set the wiper speed for a long or short delay between wipes. The closer to the top of the lever, the shorter the delay time. 3-8