1998 Oldsmobile Aurora Owner's Manual - Page 159

Defogging and Defrosting Rear Window Defogger w luJ R.DEFOG: Press this button to warm the defogger grid on the rear window. An indicator light in the button will glow while the rear window defogger is operating. DEF R. DEFOG On cool, humid days use the defog setting to keep the windows clear while also providing through the heat lower outlets. Press DEF to quickly remove fog or ice from the windshield. At speeds above 30 mph (48 k d h ) , the rear defogger will stay on until you press the R. DEFOG button again. At speeds below 30 mph (48 k / )the rear mh, window defogger will turn off automatically after about 10 minutes of use. If you press it again, the defogger will operate forabout five minutes only. You can also turn the defogger off by turning off the ignition. Do not attach a temporary vehicle license across the defogger grid on the rear window. When you operate the rear window defogger, the outside rearview mirrors are also heated to helpremove ice and fog.