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:

    Rear fog lamp
    To switch on the rear fog lamp: turn the SmartKey in the ignition lock to position 2 or start the engine. Turn the light switch to or (vehicles with front fog lamps), or turn the light s ...

    Activation conditions
    You can activate the HOLD function if: • the vehicle is stationary. • the driver's door is closed or your seat belt is fastened. • the electric parking brake is released. • the hood is clo ...

    Coupling up a trailer
    WARNING Vehicles with air suspension program: While you are coupling or decoupling a trailer, make sure nobody locks or unlocks the vehicle and/or opens or closes doors or the tailgate. The v ...