Automatic engine start

The engine is started automatically if you:

 - release the brake pedal when HOLD is not activated and the transmission is in position D or N
 - shift the transmission to position R
 - depress the accelerator pedal
 - have switched off the ECO start/stop function by pressing the ECO button
 - switch to drive program S, S+ or M
 - unfasten your seat belt or open the driver's door

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The engine is also started automatically if:

 - the vehicle starts to roll.
 - the brake system requires this.
 - the system detects moisture on the windshield when the air-conditioning system is switched on.
 - the charge level of the battery is too low.
 - the driver's seat belt is removed or the driver's door is opened.

    See also:

    Efficient diesel and petrol engines
    Apart from the trailblazing hybrid of the Mercedes-Benz S400 Hybrid, the range of engines for the 2010 Mercedes-Benz S-Class comprises eight other powerful units: two diesel variants and six petro ...

    Automatic headlamp mode
    To switch on automatic headlamp mode: turn the light switch to or . SmartKey in position 1 in the ignition lock: the parking lamps are switched on or off automatically depending on the br ...

    Crash-responsive emergency lighting
    The interior lighting is activated automatically if the vehicle is involved in an accident. To switch off the crash-responsive emergency lighting: press the hazard warning lamp button. or Loc ...