2011 Lexus LS 600h Owners Manual - Page 238

2-4. Using other driving systems n Radar sensor and grille cover Always keep the sensor and grille cover clean to ensure that the vehicle-to-vehicle distance control operates properly. (Some obstructions, such as snow, ice or plastic objects, cannot be detected by the obstruction sensor.) Dynamic radar cruise control is canceled if an obstruction is detected. Grille cover Radar sensor n Warning lights, messages and buzzers for dynamic radar cruise control Warning lights, messages and buzzers are used to indicate a system malfunction or to inform the driver of the need for caution while driving. (→P. 498, 508) n Approach warning In the following instances, there is a possibility that the warnings will not occur: l When the speed of the vehicle ahead matches or exceeds your vehicle's speed l When the vehicle ahead is traveling at an extremely slow speed l Immediately after the cruise control speed was set l At the instant the accelerator is applied 238