See also:

Hiding a service message
  Press the or button on the steering wheel. ...

Restoring the factory settings
Press the and buttons simultaneously for approximately six seconds until the battery check lamp flashes twice. ...

4MATIC: high-performance all-wheel-drive system with sophisticated control systems
The 4MATIC powertrain at the heart of the Mercedes-Benz GLK-Class is one of the most capable all-wheel-drive systems on the market. The driving dynamics systems ESP®, ASR and 4ETS are superbly har ...