2004 Mercedes G-Class Owner's Manual - Page 155

Controls in detail Good visibility Rear window defroster Turn the SmartKey in starter switch to position 2. Activating Press button F in the control panel of the climate control. The indicator lamp in the button comes on. Deactivating Press button F in the control panel of the climate control. The indicator lamp in the button goes out. ! Heavy accumulation of snow and ice should be removed before activating the defroster. The defroster is automatically turned off after approximately 6-17 minutes of operation depending on the outside temperature and vehicle speed. If several power consumers are turned on simultaneously, or the battery is only partially charged, it is possible that the defroster will automatically turn itself off. When this happens, the indicator lamp inside the switch starts blinking. As soon as the battery has sufficient voltage, the defroster turns itself back on. i The rear window defroster uses a large amount of power. To keep the battery drain to a minimum, turn off the defroster as soon as the rear window is clear. 155