Switching on power supply or ignition with the start/stop button
WARNING Risk of accident and injury due to children left unattended in the vehicle
If children are left unsupervised in the vehicle, they could, in particular:
open doors, thereby endangering other persons or road users.
get out and be struck by oncoming traffic.
operate vehicle equipment and become trapped, for example.
In addition, the children could also set the vehicle in motion, for example by:
releasing the parking brake.
changing the transmission position.
starting the vehicle.
Never leave children unattended in the vehicle.
When leaving the vehicle, always take the key with you and lock the vehicle.
Keep the vehicle key out of reach of children.
DANGER Risk of death caused by exhaust gases
Combustion engines emit poisonous exhaust gases such as carbon monoxide. Inhaling these exhaust gases is hazardous to health and leads to poisoning.
Never leave the engine or, if present, the auxiliary heating running in an enclosed space without sufficient ventilation.
WARNING Risk of fire due to flammable material in the engine compartment or the exhaust system
Flammable materials may ignite.
Therefore, check regularly that there are no flammable materials in the engine compartment or on the exhaust system.
Requirements
To switch on the power supply:
press button 
once. You can now activate the windscreen wipers, for example.
The power supply is switched off again when one of the following conditions is met:
the driver's door is open.
you press button
twice.
To switch on the ignition:
press button twice. The indicator lamps appear in the instrument cluster.
The ignition is switched off again when one of the following conditions is met:
you do not start the vehicle within 15 minutes.
you press button
once.