2008 Subaru Impreza Owner's Manual - Page 156

3-40 Instruments and controls The rear window defogger operates only when the ignition switch is in the "ON" position. The rear window defogger button is located on the climate control panel. To turn on the defogger, push the button. To turn it off, push the button again. The indicator light located on the button lights up while the rear window defogger is operating. The defogger will automatically shut off after approximately 15 minutes. If the window clears before that time, push the button to turn it off. It also turns off when the ignition switch is turned to the "Acc" or "LOCK" position. If defrosting or defogging is desired when you restart your vehicle, you have to push the button to turn it on again. Your SUBARU dealer can set your rear window defogger for continuous operation. Contact your SUBARU dealer for details. Once the rear window defogger has been set for continuous operation, the rear window defogger repeatedly operates for 15 minutes, stops for two minutes, and again operates for 15 minutes. If the battery voltage drops below the permissible level, continuous operation is canceled and operation stops as described in the following. . If the battery voltage drops below the permissible level within 15 minutes of depression of the button, continuous operation is canceled and the rear window defogger stops operating 15 minutes later. . If the battery voltage drops below the permissible level after the rear window defogger has, following depression of the button, operated for 15 minutes, stopped operating for two minutes, and started operating again, the rear window defogger immediately stops operating. window defogger is operating. . Turn on the rear window defogger if the wiper is frozen to the glass. CAUTION . Do not use sharp instruments or window cleaner containing abrasives to clean the inner surface of the rear window. They may damage the conductors printed on the window. . To prevent the battery from being discharged, do not operate the defogger continuously for any longer than necessary. NOTE . If your vehicle is equipped with the outside mirror defogger, the outside mirror defogger operates while the rear