2009 Mercedes R-Class Owner's Manual - Page 201

Controls in detail Rear window defroster Residual heat and ventilation With the engine switched off, it is possible to continue to heat or ventilate the interior for up to 30 minutes. This feature makes use of the residual heat produced by the engine. Using driver-side settings for all temperature zones This feature is only available in Canada vehicles. You can use the settings of the driver's side, such as temperature, air volume and air distribution, for all temperature zones. These settings only need to be made once and the climate control system will automatically regulate the settings for all temperature zones quickly and comfortably. X Activating: Adjust the air temperature, air volume and air distribution. X Rear window defroster G Warning! Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. 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 switched off automatically after some time of operation depending on the outside temperature. X Switch on the ignition. X i How long the system will provide heating depends on the coolant temperature and the battery voltage. Regardless of the temperature and air volume set on the climate control panel, an interior temperature is aimed at by 72‡ (22†) and the blower runs on low speed to protect the vehicle battery. X X X Activating: Switch off the ignition. Press button 9. The indicator lamp in the button comes on. Deactivating: Press button 9 again. The indicator lamp in the button goes out. Press button ;. The indicator lamp in the button comes on. The driver-side settings are used for all temperature zones. Deactivating: Press button ; again. The indicator lamp in the button goes out. X Switching on: Press button 1 on the respective climate control panel. The indicator lamp in the button comes on. Switching off: Press button 1 again. The residual heat is deactivated automatically: Rwhen Rafter Rif Rif X the ignition is switched on approximately 30 minutes the battery voltage drops the coolant temperature is too low i If you manually set the temperature, air volume or air distribution for the passenger side or the rear passenger compartment when the MONO setting is active, the MONO setting will be switched off. ! 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. Z 199