2004 Lexus LS 430 Owners Manual - Page 339

STARTING AND DRIVING Especially in cold weather, a malfunction warning screen may appear on the display due to frozen sensors. If the "Clean Park Sonar" appears on the display, be sure to clean the sensor. If the "Clean Park Sonar" appears despite no mud, ice or snowflakes on the sensor, the sensor might have malfunctioned. Have your vehicle checked by your Lexus dealer. In the following conditions, the detection range may be affected: D When you stop your vehicle in extreme hot or cold weather. D Foreign matter such as snowflakes or mud gets on the sensor. The Lexus park assist system may detect the following by mistake: D Bumpy roads or gravelled roads or grass when driving on such surfaces, or on grass D Devices issuing ultrasonic waves, such as a horn from another vehicle, motorcycle engine, air braking sound from heavy-duty vehicles, if such a device is operated around your vehicle D Rain or water splashing over the sensor D The ground on which the vehicle is tilted D Radio antenna or fender pole mounted on your vehicle D Mud, ice or snowflakes on the sensor D Tall curb stone D Towing eyelet mounted on your vehicle D Towing hitch mounted on your vehicle 319