Activating/deactivating the automatic locking mechanism
Requirements
The power supply or the ignition is switched on.
The doors are closed.
When the ignition is switched on and the vehicle is travelling at a speed above 15 km/h, the vehicle locks automatically.
Central locking buttons (vehicles with electrically adjustable front seats)
Central locking buttons (vehicles with manually adjustable front seats)
If the vehicle is being tested on a roller dynamometer or is being tow-started or push-started, there is a risk of being locked out when the function is activated.
To activate:
press and hold button 
until you hear a tone. To deactivate:
press and hold button 
until you hear a tone.