2011 Lexus LS 600h Owners Manual - Page 311

2-4. Using other driving systems Driver monitor sensor (with driver monitor system) Detects the direction the driver is facing. The system determines whether the driver is facing forward. 2 When driving 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 A camera sensor cannot detect obstacles in the following situations: l A camera sensor is directly receiving intense light, such as sunlight. l Visibility is poor because of bad weather or other reasons. l The sensor temperature is extremely high. n The pre-collision system is operational when l Pre-collision seat belts: Operating conditions A • Vehicle speed is above 4 mph (5 km/h). • The relative speed difference between your vehicle and another vehicle that is forward of your vehicle, or the speed at which your vehicle is approaching an obstacle is greater than 19 mph (30 km/h). • The front occupants are wearing a seat belt. Operating conditions B • Vehicle speed exceeds 19 mph (30 km/h). • The system detects sudden braking or skidding. • The front occupants are wearing a seat belt. 311