2004 GMC Yukon Owner's Manual - Page 316

To engage the 4-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 to the left or right. While in the 4-wheel steer tow mode, it is possible the steering wheel may be slightly off center. For more information, see Towing a Trailer on page 4-63. Car Washes for QUADRASTEER™ Equipped Vehicles Notice: Because your vehicle has a wider rear track a small number of 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 the manager. 4-18