2011 Toyota Highlander Owners Manual - Page 246

2-4. Using other driving systems Downhill assist control system (4WD models) With the downhill assist control system, the vehicle is able to descend a steep hill, maintaining a constant low speed of about 3 mph (5 km/h) without brake pedal operation. n Activating the downhill assist control system Press the "DAC" switch. The downhill assist control system indicator will come on to indicate that the downhill assist control system is activated. Pressing the switch again turns the system off. While the downhill assist control system is operating The slip indicator will flash to indicate that the downhill assist control system is operating, and the stop lights and high mounted stoplight will turn on. 218