2010 Lexus HS 250h Owners Manual - Page 200

2-3. Operating the lights and windshield wipers n Raindrop sensor (vehicles with rain-sensing windshield wipers) The raindrop sensor judges the amount of raindrops. An optical sensor is adopted. It may not operate properly when sunlight from the rising or setting of the sun intermittently strikes the windshield, or if bugs etc. are present on the windshield. If the wiper switch is turned to the position while the "POWER" switch is in ON mode, the wipers will operate once to show that AUTO mode is activated. n In extremely hot or cold weather (vehicles with rain-sensing windshield wipers) The system will turn off if the windshield gets extremely hot (more than 194°F [90°C]) or cold (less than 14°F [-10°C]). If it does not operate, use other than AUTO mode. n If no windshield washer fluid sprays Check that the washer nozzles are not blocked if there is washer fluid in the washer fluid tank. CAUTION n Caution regarding the use of windshield wipers in "AUTO" mode (vehicles with rain-sensing windshield wipers) The windshield wipers may operate unexpectedly if the sensor is touched or the windshield is subject to vibration in "AUTO" mode. Take care that your fingers etc. do not become caught in the windshield wipers. 198