2007 Mercedes SL-Class Owner's Manual - Page 184

Controls in detail Good visibility Rear window defroster The rear window defroster uses a large amount of power. To keep the 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! Deactivating Press button F ( page 185) once more. The indicator lamp on the button goes out. ! The rear window defroster cannot be switched on when the retractable hardtop is open. The indicator lamp will start flashing if the hardtop is open. Close the retractable hardtop. The rear window defroster can then be switched on. 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. Switch on the ignition ( page 39). Activating Press button F on the automatic climate control panel ( page 185). The indicator lamp on the button comes on. ! 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 automatically switches back on automatically. 183