2007 Mercedes R-Class Owner's Manual - Page 218

Controls in detail Good visibility ! With the sunshade raised and the respective door window open, the sunshade could disengage and snap back when driving at high vehicle speeds, e.g. on highways, and damage the retractor. You should therefore always either close the door window or lower the sunshade when driving at high speed. Rear window defroster The rear window defroster uses a large amount of power. To keep battery drain to a minimum, switch off the defroster as soon as the rear window is clear. The defroster is automatically deactivated after approximately 6 to 17 minutes of operation depending on the outside temperature. Warning! Activating Press button 1 on the climate control panel ( page 220) or the automatic climate control* panel ( page 234). The indicator lamp on the button comes on. Deactivating Press button 1 once more. The indicator lamp on the button goes out. G Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. ! If the rear window defroster switches off too soon and the indicator lamp starts flashing, too many electrical consumers are operating simultaneously and there is insufficient voltage in the battery. The system responds automatically by switching the rear window defroster off. As soon as the battery has sufficient voltage, the rear window defroster switches back on automatically. Switch on the ignition ( page 39). 217