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:

    Active Lane Keeping Assist
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    Tradition: an exclusive line of ancestors
    The new generation CL-Class continues the great tradition of Mercedes-Benz coupes, which reaches back to the legendary supercharged cars of the 1920s and '30s. Since the 1950s Mercedes-Benz has pr ...

    System self-test
    The indicator lamp illuminates when you: • turn the SmartKey to position 1 or 2 in the ignition lock • Rpress the KEYLESS-GO Start/Stop button once or twice If an adult occupant is properly s ...