2003 GMC Sierra 1500 Pickup Owner's Manual - Page 296

The 4 Wheel Steer system is equipped with three different driving modes: Two wheel steering (2) Four wheel steering (4) * Four wheel steering with a trailer mode (q ) 2: In this mode the vehicle will operate like any other vehicle with two wheel steering. If you want to use 2 wheel steer mode and your vehicle is not in this mode, press the button until the 2 indicator, located to the right of the 4 Wheel Steer button, lights up. If the 2 indicator is flashing you will have to center the steering wheel by turning it to the left or right. : 4 Your vehicle will return to 2 when the transmission is shifted into NEUTRAL, for example when entering a car wash. 0 09 I I U 2 4 If you want to use tire chains, the vehicle needs to be in 2 wheel steer mode. 4: In this mode all four wheels will help steer the vehicle. If you want to use 4, and your vehicle is not in this mode, press the button, until the 4 indicator, located to the right of the 4 Wheel Steer button,comes on and stays on. If the 4 indicator is flashing you will have to center the steering wheel by turning it to the left orright. 0 0 =wF The switch is located on the instrument panel. 4-15