2006 Lexus GS 300 Owners Manual - Page 468

STARTING AND DRIVING Pre−collision sensor The millimeter wave radar sensor detects vehicles or objects near or on the road your vehicle is traveling and determines the possibility of a collision based on the object position, vehicle speeds and the course you are traveling. The pre−collision sensor will operate when the vehicle speed is about 5 km/h (3 mph) or over. CAUTION To ensure that pre−collision system will function properly while driving, observe the following. Failure to follow these instructions could reduce the effectiveness of the pre−collision system in case of vehicle accident: D Always keep the millimeter wave radar sensor and grille cover clean. When cleaning, use a soft cloth and be careful not to damage the sensor and grille cover. D Avoid strong impacts around the millimeter wave radar sensor. An incorrect millimeter wave radar sensor alignment will result in system malfunction. A special device is required to adjust the millimeter wave radar sensor alignment. Be sure to have the sensor adjusted by your Lexus dealer. D Do not disassemble the millimeter wave radar sensor. G31019 " 1 Millimeter wave grille cover 2 Millimeter wave radar sensor The millimeter wave radar sensor is installed in the front grille of the hood. The millimeter wave radar sensor cannot detect plastic objects such as pylons, and may not detect people, animals, bicycles, motor cycles, trees, snowbanks, etc. as objects with which your vehicle may collide. D Do not affix a sticker (including a transparent sticker) or attach an accessory around the millimeter radar sensor or the grille cover. D Do not modify or paint the grille cover. When replacing the grille cover, be sure to use a genuine grille cover. 444