See also:

Roadside Assistance button
X Press and hold Roadside Assistance button 1 for more than two seconds. This initiates a call to the Mercedes-Benz Customer Assistance Center. The indicator lamp in Roadside Assistance button 1 ...

Problems with the cooling with air dehumidification function
When you press the button, the indicator lamp in the button flashes three times or remains off. You can no longer switch on the cooling with air dehumidification function. •► Consult a ...

Before changing a fuse
  Park the vehicle and apply the parking brake.   Switch off all electrical consumers.   Remove the SmartKey from the ignition lock. The fuses are located in various fuse boxes: ...