2006 Mercedes SLK-Class Owner's Manual - Page 178

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! Switching on Press the rear window defroster switch F in the control panel of the climate control ( page 179) or the automatic climate control* ( page 192). The indicator lamp on the rear window defroster switch F comes on. Switching off Press the rear window defroster switch F again in the control panel of the climate control or the automatic climate control*. The indicator lamp on the rear window defroster switch F goes out. ! The rear window defroster cannot be switched on when the retractable hardtop is open. The indicator lamp starts flashing if the hardtop is open. Close the retractable hardtop first. The rear window defroster can be switched on again. ! If the rear window defroster switches off too soon and the indicator lamp starts flashing, this means that too many electrical consumers are operating simultaneously and there is insufficient voltage in the battery. The system responds automatically by deactivating the rear window defroster. As soon as the battery has sufficient voltage, the rear window defroster automatically turns itself back 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. 177