2011 Toyota Sequoia Owners Manual - Page 247

2-4. Using other driving systems n Sensor detection information l Certain vehicle conditions and the surrounding environment may affect the ability of a sensor to correctly detect an obstacle. Particular instances where this may occur are listed below. There is dirt, snow or ice on a sensor. A sensor is frozen. A sensor is covered in any way. The vehicle is leaning considerably to one side. On an extremely bumpy road, on an incline, on gravel, or on grass. The vicinity of the vehicle is noisy due to vehicle horns, motorcycle engines, air brakes of large vehicles, or other loud noises producing ultrasonic waves. • There is another vehicle equipped with parking assist sensors in the vicinity. • A sensor is coated with a sheet of spray or heavy rain. • The vehicle is equipped with a fender pole or radio antenna. • A bumper or sensor receives a strong impact. • The vehicle is approaching a tall or right-angled curb. • In harsh sunlight or intense cold weather. • The area directly under the bumpers is not detected. Objects lower than the sensors or thin stakes etc. may be detected initially, but as they draw closer, they may cease to be detected. • A towing hitch is mounted to the vehicle. • A non-genuine Toyota suspension (lowered suspension etc.) is installed. • When attaching a two-way radio antenna. • When a towing eyelet is mounted on your vehicle. • When the bumper is damaged. In addition to the examples above, there are instances in which, because of their shapes, signs and other objects may be judged by a sensor to be closer than they are. l The shape of the obstacle may prevent a sensor from detecting it. Pay particular attention to the following obstacles Wires, fences, ropes, etc. Cotton, snow and other materials that absorb sound waves Sharply-angled objects Low obstacles 214