2006 Lexus IS 350 Navigation Manual - Page 232

IS350/250_Navi_U (L/O 0508) 232 AIR CONDITIONING If manual switching of air intake is desired - Turning off the air conditioning manually will cancel the EXHAUST GAS AUTOMATIC mode. If you select the "AUTO" mode during fan operating, the air conditioning turns on and the EXHAUST GAS AUTOMATIC mode will operate. For normal use, it is best to keep the air intake control button set to OUTSIDE AIR mode. If recirculated air is used during heating, the windows will fog up more easily. Each time you push the air intake control button, the mode changes in order from the RECIRCULATED AIR mode to AUTOMATIC mode to OUTSIDE AIR mode, then back to the RECIRCULATED AIR mode. Each indicator light shows which mode is now selected. 1 RECIRCULATED AIR mode - If quick circulation of cooled air is desired, select this mode. 2 EXHAUST GAS AUTOMATIC mode (on some models) - If the outside air contains harmful substances like exhaust gas (i.e., when the vehicle running just in front of your vehicle accelerates rapidly), the system changes automatically from the OUTSIDE AIR mode (with indicators 2 and 3 on) to the RECIRCULATED AIR mode (with indicators 1 and 2 on). 3 OUTSIDE AIR mode - The system will take fresh outside air into the vehicle.