2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 228

Turn Signal/Multifunction Lever Turn and Lane-Change Signals An arrow on the instrument panel cluster flashes in the direction of the turn or lane change. Move the lever all the way up or down to signal a turn. The lever on the left side of the steering column includes the following: G : Turn and Lane Change Signals Raise or lower the lever for less than one second until the arrow starts to flash to signal a lane change. This causes the turn signals to automatically flash three times. It will flash six times if tow-haul mode is active. Holding the turn signal lever for more than one second will cause the turn signals to flash until you release the lever. The lever returns to its starting position whenever it is released. If after signaling a turn or a lane change the arrows flash rapidly or do not come on, a signal bulb could be burned out. Have the bulbs replaced. If the bulb is not burned out, check the fuse. See Fuses and Circuit Breakers on page 6‑130. 53: Headlamp High/Low-Beam Changer N : Windshield Wipers L : Windshield Washer Flash-to-Pass. Exterior Lamps. Information for these features is on the pages following. 4-4