Switching on the start/stop system The function is automatically activated every time the ignition is switched on. The instrument cluster display will show information about the current status. – The window heater is not switched on. – Reverse gear is not engaged. – The outside temperature is neither too high nor too low. Always switch off the automatic engine start/ stop system when driving through water. The engine may automatically switch off when the vehicle is stationary if the conditions for au- tomatic engine switch-off are met, e.g. if the de- frost function is switched off.
Indicator lamps If the indicator lamp lights up, the start/stop system is available and automatic engine stop is active. Conditions for automatic restart The engine can start automatically under the fol- lowing conditions: If the indicator lamp lights up, the start/stop system is not available or the start/stop system has started the engine automatically → page 102. – If the temperature inside the vehicle greatly increases or decreases. The display on the instrument cluster may show the status of the start/stop system. – If the vehicle starts rolling. – If the electric voltage of the 12-volt vehicle battery drops. Vehicles with a manual gearbox:
– Disengage the gear and release the clutch pedal when the vehicle is coming to a stop, or when it is stationary. The engine stops. – If the steering wheel is moved. As a general rule, the engine always starts again automatically when required by the detected sit- uation and the vehicle. – Depress the clutch pedal to restart the engine. Conditions that require a manual engine start The engine must be started manually in the fol- lowing conditions: Vehicles with an automatic gearbox – To stop, press and hold the brake pedal when the vehicle is stationary. – To restart the engine, take your foot off the brake pedal or depress the accelerator. – If the bonnet is opened.
– If the driver door is opened. Activating and deactivating the start/stop system manually – Press the button → Fig. 86 in the centre console to deactivate the system manually. If the start/stop system has been deactivated, the indicator lamp in the button lights up. Important preconditions for automatic engine switch-off – The driver is wearing the seat belt. – The driver door is closed. – A minimum engine temperature has been reached. – The bonnet is closed. – Press the button → Fig. 86 in the centre console again to activate the system manually again. – Vehicles with Climatronic:
the temperature of the vehicle interior is within the preset tempera- ture range, and the humidity level is not too high. The instrument cluster shows the status of the start/stop system every time the button is pressed. – The defrost function of the air conditioning system is not switched on. If the start/stop system has switched off the en- gine, the engine will start again as soon as the system is deactivated with the button . – The charge level of the 12-volt vehicle battery is sufficient. Always switch off the automatic engine start/ stop system when driving through water. – The temperature of the 12-volt vehicle battery is not too low or too high.
– The vehicle is not on a steep incline. – Vehicles with an automatic gearbox: the steering wheel is not turned too sharply. Owner's manual 102