1999 Subaru Legacy Owner's Manual - Page 139

Instruments and controls Indicator light HB0376 Before turning on the wiper deicer, remove any snow from the windshield. To turn on the wiper deicer, push the switch. The indicator light located on the switch lights up while the wiper deicer is operating. The wiper deicer will automatically shut off after about 15 minutes. If the wiper blades have been deiced completely before this time, push the switch to turn it off. It also turns off when the ignition switch is turned to the "ACC" or "LOCK" position. If deicing is not complete when you restart your vehicle, you have to push the switch to turn the deicer on again. Rear window defogger switch D 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. D To prevent the battery from being discharged, do not operate the defogger continuously for any longer than necessary. The rear window defogger operates only when the ignition switch is in the "ON" position. CAUTION - CONTINUED - 3-23