2003 Mercedes ML-Class Owner's Manual - Page 131

Controls in detail Automatic climate control 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. Activating Switch ignition on. Press button F ( page 125). The indicator lamp on the button lights up. Deactivating Press button F again. The indicator lamp on the button goes out. Rear passenger compartment ventilation and rear automatic climate control Deactivating For an improved cooling or heating output in the front passenger compartment, you can switch off the rear passenger compartment ventilation. Press button § ( page 125). The indicator lamp on the button lights up. The operation of the rear automatic climate control and the fresh air supply to the rear compartment is shut off. Activating Press button § again. The indicator lamp on the button goes out. The rear automatic climate control switches to automatic mode and fresh air enters the rear compartment. Warning! 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 blinking, 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. 131