2003 GMC Sierra 1500 Pickup Owner's Manual - Page 298

To engage the4 Wheel Steer tow mode, press the button until the 4 and tow mode indicators light up on the instrument panel. If the tow indicator is flashing you will have to center the steering wheel by turning it tothe left or right. While the 4 wheel steer tow mode, it is in possible thesteering wheel may beslightly off center. For more information, see Towing a Trailer on page 4-66. Car Washes for QUADRASTEERTM Equipped Vehicles Notice: Because your vehicle has a wider rear of track a small number older car washes may be too narrow for your vehicle. Conveyor systems on some automatic car washes may damage your vehicle. Only use conveyor system car washes with 13-inch (33 cm) wide conveyor rails and/or stationary washes with at least 82 inches (208 cm) between the rails. Before using the car wash check with themanager. 4-17