2013 Lexus LX 570 Owners Manual - Page 362

2-4. Using other driving systems Radar sensor Detects vehicles or other obstacles on or near the road ahead and determines whether a collision is imminent based on the position, speed, and heading of the obstacles. When traveling on a road with very light traffic and very little to reflect the radar waves emitted by the radar sensor, the system may decide that the radar sensor is dirty, even if the sensor is not actually dirty. The system will automatically restore itself when reflected radar waves are detected. n Obstacles not detected The sensor cannot detect plastic obstacles such as pylons. There may also be occasions when the radar sensor cannot detect pedestrians, animals, bicycles, motorcycles, trees, or snowdrifts. n The pre-collision system is operational when l Seat belts (situation 1) • Vehicle speed is above 4 mph (5 km/h). • The speed at which your vehicle is approaching the obstacle or the vehicle running ahead of is greater than about 19 mph (30 km/h). • The front occupants are wearing a seat belt. l Seat belts (situation 2) • Vehicle speed exceeds 19 mph (30 km/h). • The system detects sudden braking or skidding. • The front occupants are wearing a seat belt. 356 LX570_U (OM60G53U)