2003 Lexus LS 430 Owners Manual - Page 270

STARTING AND DRIVING When vehicle−to−vehicle distance control mode is activated, you must still be attentive to road and traffic conditions. Should your vehicle speed decrease below about 40 km/h (25 mph), the dynamic laser cruise control will shut off, requiring you to apply the brakes to slow. When a vehicle ahead slows suddenly, stops or a vehicle cuts in front, the system may slow your vehicle abruptly, but the automatic braking will cease if the speed decreases below about 40 km/h (25 mph) requiring the driver's manual application of brakes. D Protective film is attached to the reflectors on the vehicle ahead, or reflectors are not installed on the vehicle ahead or are damaged. D Heavy luggage which is loaded in your trunk or on top of your rear seats is raising up the nose of your vehicle. D The laser radar sensor automatically detects dirt if dirt is sticking to the sensor glass of your vehicle, and if detected, a message is shown on the multi−information display. However, if the glass sensor is covered with a transparent or translucent vinyl bag, icicle, etc., dirt may not be detected, resulting in improper vehicle−to−vehicle distance. Continue driving with due care to the vehicle ahead. If dirt is detected, the dynamic laser cruise control function is automatically cancelled. Always keep the sensor glass clean. CAUTION Certain conditions make vehicle detection difficult or impossible. D As this system operates by detecting primarily the reflectors of the vehicle ahead, the distance cannot be accurately detected in the following cases, resulting in improper vehicle−to−vehicle distance. D The vehicle ahead has higher ground clearance, which means that the placement of the reflectors is in a higher position. D The rear section of the vehicle ahead is extremely dirty. D The vehicle ahead or other vehicles around you are flinging up water or snow. D Excessive exhaust gas (black smoke) is coming from the vehicle ahead or other vehicles around you, obscuring your front view. 256