2009 Toyota Sienna Owners Manual - Page 241

2-4. Using other driving systems n Sensor detection information l Certain vehicle conditions and the surrounding environment may affect the ability of the sensor to correctly detect obstacles. Particular instances where this may occur are listed below. There is dirt, snow or ice on the sensor. The sensor is frozen. The 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. • The sensor is coated with a sheet of spray or heavy rain. • The vehicle is equipped with a fender pole or wireless antenna. • The bumper or sensor receives a strong impact. • The vehicle is approaching a tall or curved curb. • In harsh sunlight or intense cold weather In addition to the examples above, there are instances in which, because of their shapes, signs and other objects may be judged by the sensor to be closer than they are. l The shape of the obstacle may prevent the sensor from detecting it. Pay particular attention to the following obstacles Wires, fences, ropes etc. Cotton, snow and other materials that absorb radio waves Sharply-angled objects Low obstacles Tall obstacles with upper sections projecting outwards in the direction of your vehicle • Objects just under the bumper • Objects very close to your vehicle • A person near the vehicle (depending on the type of clothes worn 2 When driving 213