ISIS Emergency Call Function

ISIS Emergency Call Function

Two different emergency calls are possible by telephone. An automatic emergency call triggered by the SIM, which has detected a corresponding crash severity, as well as a manually triggered emergency call via the emergency (SOS) call button.

To place an emergency call by telephone, the telephone and the telephone interface, including antenna system, must be on standby and supplied with sufficient power.

After triggering of the emergency call, an SMS message (Short Message Service: info such as vehicle location, how many airbags were deployed and what speed the crash occurred at) is sent to the service provider and a voice connection is set up.

Two numbers are set for the two emergency call functions; these are dialled alternately until a connection is set up. If no connection has been set up after 60 seconds, the telephone dials the emergency number 911.

To support any recovery activity that might be necessary, the Light Module switches on the interior lighting and the hazard warning lights.

The central locking system is also unlocked by the CAS (Car Access System).

Automatic Emergency Call

If the ISIS system detects a crash of sufficient severity, the emergency call by telephone is triggered automatically. The emergency call contains data from the navigation computer concerning the location of the vehicle. When the emergency call reaches the service provider, the location data is displayed on the Control Display.







There is a direct, serial, single-wire connection between the SIM and telephone. If the connection is disrupted or fails, the overall bus system is used to trigger the emergency call.







The telegram then goes from the SIM to the Central Gateway Module via the K-CAN to the Control Display and the MOST bus to the telephone. Once an emergency call has been triggered, it cannot be cancelled. To ensure that the emergency call has reached the provider, an acknowledgement is transmitted, and this is stored in the system. The service provider sets up a voice connection to the vehicle and receives confirmation of the emergency call. If no voice connection is set up or the occupants are unable to respond, the rescue services are notified automatically.

Manual Emergency Call







In the event of an emergency, the driver or passengers can press the emergency call button. The current vehicle position is then displayed in the Control Display along with a message indicating that the emergency call has been placed.

The service provider sets up a voice connection to the vehicle and receives confirmation of the emergency call. Once the voice connection to the provider has been set up, the green button display flashes. The rescue services are then notified and this is indicated on the Control Display.