2009 Subaru Forester Owner's Manual - Page 143
2009 Subaru Forester Manual
Page 143 highlights
3-32 Instruments and controls 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 2 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. Windshield wiper deicer (if equipped) 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. Manual climate control system NOTE . If your vehicle is equipped with the outside mirror defogger, the outside mirror defogger operates while the rear Automatic climate control system