2011 Lexus IS F Owners Manual - Page 178

2-4. Using other driving systems CAUTION n Conditions under which the vehicle-to-vehicle distance control may not function correctly Apply the brakes as necessary in the following conditions as the radar sensor may not be able to correctly detect vehicles ahead, and an accident may result. l When water or snow thrown up by the surrounding vehicles hinders the function- ing of the sensor l When your vehicle is pointing upwards (caused by a heavy load in the trunk, etc.) l When the road curves or when the lanes are narrow l When steering wheel operation or your position in the lane is unstable l When the vehicle ahead of you decelerates suddenly n To ensure the radar sensor functions correctly Do not do the following to the sensor or grille cover as doing so may cause the sensor not to function correctly and could result in an accident. l Stick or attach anything to them l Leave them dirty l Disassemble, or subject them to strong shocks l Modify or paint them l Replace them with non-genuine parts 180