2004 Lexus LS 430 Owners Manual - Page 392

STARTING AND DRIVING CAUTION To ensure that pre-collision safety system will function properly while driving, observe the following. Failure to follow these instructions could reduce the effectiveness of the pre-collision safety 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. " 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 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. 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 cover, be sure to use a genuine cover. 31L359a 372