The vehicle is switched on.
The starter battery is sufficiently charged.
If restraint systems such as airbags or seat belt tensioners are activated during an accident, the Mercedes-Benz emergency call system automatically initiates an emergency call.
for SOS button 
. The indicator lamp in SOS button flashes until the emergency call is finished.
A voice connection is made to the Mercedes-Benz emergency call centre.
A message with the accident data is transmitted to the Mercedes-Benz emergency call centre.
The Mercedes-Benz emergency call centre can transmit the vehicle position data to one of the public emergency services call centres.
Remain in the vehicle if the road and traffic conditions permit you to do so until a voice connection is established with the emergency call centre operator.
Based on the call, the operator decides whether it is necessary to call rescue teams and/or the police to the accident site.
In certain situations data is also transmitted in the voice channel to the Mercedes-Benz emergency call centre.
This allows measures for rescue, recovery or towing to a Mercedes-Benz Service Centre to be initiated quickly.
If the Mercedes-Benz emergency call system cannot connect to the Mercedes-Benz emergency call centre, the emergency call is automatically sent to the public emergency services call centre.
If no connection can be made to the public emergency services, a corresponding message appears in the display.
button on the steering wheel.