2005 Lexus LS 430 Owners Manual - Page 417

STARTING AND DRIVING Pre−collision safety failure warning w278 The above message appears in the following conditions: D The millimeter wave radar sensor or the grille cover is dirty. 31L589 Clean the grille or sensor with a soft cloth to remove the dirt. D The pre−collision seat belts are activated repeatedly for a short time. The system turns off temporarily for overheating protection, but turns back on after a while. If there is a problem somewhere in the pre−collision safety system, the master warning light comes on, a warning tone sounds, and either of the following messages may appear. w277 If there is a problem somewhere in the pre−collision safety system, the above message appears. If the above message appears, the pre−collision safety system may not operate. Contact your Lexus dealer as soon as possible to service the vehicle. 378