2012 GMC Sierra Owner's Manual - Page 164

5-26 Instruments and Controls If the regular brake system warning light is also on, the vehicle does not have antilock brakes and there is a problem with the regular brakes. See Brake System Warning Light on page 5‑25. For vehicles with a Driver Information Center (DIC), see Brake System Messages on page 5‑40 for all brake‐related DIC messages. If the vehicle is a hybrid, see the hybrid supplement for more information. transfer case is shifted into four-wheel drive and the front axle engages. Some delay between the shifting and the light coming on is normal. See Four-Wheel Drive on page 9‑40 for more information. Antilock Brake System (ABS) Warning Light Tow/Haul Mode Light For vehicles with the Antilock Brake System (ABS), this light comes on briefly when the engine is started. If it does not, have the vehicle serviced by your dealer. If the system is working normally the indicator light then goes off. If the ABS light stays on, turn the ignition off. If the light comes on while driving, stop as soon as it is safely possible and turn the ignition off. Then start the engine again to reset the system. If the ABS light stays on, or comes on again while driving, the vehicle needs service. If the regular brake system warning light is not on, the vehicle still has brakes, but not antilock brakes. Four-Wheel-Drive Light For vehicles with the Tow/Haul Mode feature, this light comes on when the Tow/Haul Mode has been activated. For vehicles equipped with the four-wheel-drive light, it comes on when a vehicle with a manual For more information, see Tow/Haul Mode on page 9‑39.