Emergency call

The following are possible by telephone

• an automatic emergency call by means of crash signal,
  
• a manually triggered emergency call via emergency call button.
  

For reasons of safety, a double data transfer between the Safety and Gateway Module and the telephone is installed.

• A data path consists of the connection Safety and Gateway Module> data bus K-CAN -> Car Communication Computer (or Multi Audio System Controller) -> data bus MOST -> telephone.
  
• There is also an additional direct, serial single-wire connection between the Safety and Gateway Module and the telephone. If the serial connection is disrupted or fails, the path via the above bus is used to trigger the emergency call.
  

After the emergency call has been triggered,

• an SMS signal is sent to the service provider: in cycles, the navigation system provides the telephone with a ready-made SMS (Short Message Service);
  
• a voice connection is set up.
  

Two numbers are set for the two data paths; these are dialled alternately until a connection is set up.

If no connection has been set up after 60 seconds, the user device dials the emergency number in accordance with the GSM standard (Global Standard for Mobile Telephone).

To support any rescue activities that might be necessary, the following occur automatically on crash detection

• the interior lights are switched on (by the light module),
  
• the hazard warning system is switched on (by the light module),
  
• the central locking system is unlocked (via the Car Access System).
  

Brief description of components

Telephone and conditions for the emergency call

The following factors are decisive for the operational capability of the emergency call:

• The telephone and the telephone interface, including aerial system, are ready for service.
  
• There is an adequate power supply.
  
• The telephone card is in the card reader or: the emergency SIM is inserted (Subscriber Identity Module, i.e. the key card for the telephone).
  
• The connection between the telephone and service provider has been set up or can be set up.
  

Emergency call button

• The emergency call button is fitted above the windscreen in the centre of the headlining.
  
• Pressing the emergency call button triggers the emergency call.
  
• The emergency call button has diagnostic capability: the telephone interface can detect whether the button is connected. If a fault occurs, a fault code is stored in the fault code memory.
  
• Once an emergency call has been triggered, it cannot be cancelled.
  

Service functions

Note on safety

When working on the roof lining or on the button for the sunroof, do not inadvertently trigger an emergency call manually (emergency call button)!