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Emergency call system, function - GF82.95-P-0004FLM

MODEL 212 as of 3/2/15 as of model year 2016 with CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 347 (Ecall emergency call system, Europe) without CODE 348 (Emergency call/assistant system) without CODE 359 (TELE AID emergency call system) 

Illustration shows model 212 

Fig 1: Emergency Call System Block Diagram - Shown On Model 212
G10242338Courtesy of MERCEDES-BENZ USA

Function requirements, emergency call system, general 

Emergency call system, general 

The emergency call system allows a manual or automatic emergency call to be triggered. The emergency call is received by the Mercedes-Benz Service Center. The user is spoken to in the language that is selected in the system settings of the audio equipment. If necessary, the Mercedes-Benz Service Center notifies the local rescue services. If the Mercedes-Benz Service Center is not staffed, the emergency call is automatically forwarded to the local rescue services.

If the telematics services communications module receives the "Circuit 15R" message from the electronic ignition lock control unit via the diagnostic CAN, the module checks the operational readiness of the emergency call system. After a successful check, the emergency call system is operational and "SOS ready" appears on the Audio/COMAND display. The following checks are carried out:

IMPORTANT In the event of a fault, depending on the fault type, a fault message appears on the Audio/COMAND display and is stored in the fault memory of the telematics services communications module.

The emergency call system function comprises the following subfunctions:

IMPORTANT MODEL 212 as of 3/2/15

as of model year 2016

with CODE 350 (Ecall emergency call system, Europe, gen. 3)

with CODE B54 (Live Traffic Information)

without CODE 347 (Ecall emergency call system, Europe)

without CODE 348 (Emergency call/assistant system)

without CODE 359 (TELE AID emergency call system)

The real-time traffic data service is described in the document titled, "Navigation mode, function".

Emergency call system status indication 

The status of the emergency call system is shown in the following ways:

Status indication via light-emitting diode 

The LED of the emergency call system button is used to indicate the following status:

The telematics services communications module actuates the light-emitting diode in the emergency call system button over a direct line.

Status indication on the Audio/COMAND display 

The status of the emergency call system is indicated by a text message on the Audio/COMAND display in the following cases:

The telematics services communications module transmits the display to the Audio/COMAND display via the following path:

Voice connection between vehicle and Service Center 

Once the emergency call has been triggered, the telematics services communications module sets up a voice connection with the Mercedes-Benz Service Center via the emergency call system antenna.

IMPORTANT The setup of a voice connection to the Mercedes-Benz Service Center is aborted after several unsuccessful dialing attempts, and a corresponding message appears on the Audio/COMAND display. In vehicles with CODE 810 (Sound system) or CODE 811 (Advanced sound system), the telematics services communications module transmits a signal for muting the audio sources to the sound system amplifier control unit. The sound system amplifier control unit then stops playback of the audio signals that it receives via MOST.

In vehicles except CODE 810 (Sound system) and except CODE 811 (Advanced sound system), the telematics services communications module transmits a signal for muting the audio sources to the audio equipment. The audio equipment then stops playback of the audio signals.

The hands-free system is not available for telephone calls throughout the duration of the emergency call.

After a data telegram has been transmitted to the Mercedes-Benz Service Center, the user can speak to a service receptionist via the voice connection. The Mercedes-Benz Service Center carries out the call in the language that was selected in the system settings of the audio equipment and transmitted in the data telegram. The hands-free system microphone, which is integrated into the inside rear-view mirror (A67), is used for voice commands.

The telematics services communications module receives the outgoing voice signals from the hands-free system microphone through the audio equipment.

The telematics services communications module outputs the incoming voice signals via the center instrument panel speaker.

The volume of the voice output can be adjusted using the following controls:

The signals of the right multifunction steering wheel button group are received by the telematics services communications module via the following path:

The volume settings of the audio equipment are received by the telematics services communications module via the following path:

The signals from the Audio/COMAND control panel are received by the telematics services communications module via the following route:

Position finding 

The telematics services communications module uses the satellite-supported global positioning system (GPS) to find its location. GPS is available worldwide. GPS position finding is irretrievable after vehicle transport (e.g. by train or ferry or after towing). Subsequent GPS position finding (following an interruption in satellite reception) can take several minutes. A basic position finding routine runs in parallel to the GPS position finding routine that makes it possible to also locate the position of the vehicle if GPS reception fails.

The position finding function consists of the following component functions:

GPS position finding 

In vehicles with CODE 522 (Audio 20 radio) or with CODE 531 (COMAND APS), the audio equipment receives the GPS signal from the multifunction antenna and forwards it to the telematics services communications module via the following route:

In vehicles with CODE 505 (Radio 20 NTG5 without navigation capability), the telematics services communications module receives the GPS signal from the multifunction antenna.

Additional function requirement for basic position finding 

Basic position finding 

The telematics services communications module requires the following signals for basic position finding:

The telematics services communications module receives the wheel speed and yaw rate signals from the Electronic Stability Program control unit via the following path:

The telematics services communications module receives the signal of the steering angle sensor via the following route:

The telematics services communications module uses the data to calculate the current vehicle position (longitude and latitude).

IMPORTANT Location errors in position finding, rolling backwards with "circuit 15 OFF" (ignition switched off) or transport of the vehicle falsify the basic position finding. In both cases, this deviation is automatically corrected on receipt of GPS data.

IMPORTANT MODEL 212 as of 3/2/15

as of model year 2016

with CODE 350 (Ecall emergency call system, Europe, gen. 3)

with CODE 531 (COMAND APS)

without CODE 347 (Ecall emergency call system, Europe)

without CODE 348 (Emergency call/assistant system)

without CODE 359 (TELE AID emergency call system)

The audio equipment not only sends GPS signals to the telematics services communications module, but also additional position data that likewise supports basic position finding.

Manual or automatic emergency call 

In an emergency situation, a service receptionist from the Mercedes-Benz Service Center can obtain an overview of the status inside the vehicle with the aid of the data received from the emergency call system control unit (voice connection and data telegram) and initiate appropriate help measures. An emergency call be initiated manually or automatically. These emergency calls are made for the following reasons:

IMPORTANT The automatic emergency call has priority over a manually triggered emergency call. If an automatic emergency call is triggered during a manual emergency call, the manual emergency call is interrupted. If a manual emergency call is triggered during an automatic emergency call, it is ignored. However, a data telegram containing updated position data is sent to the Mercedes-Benz Service Center, and the existing connection is maintained.

The manual or automatic emergency call function consists of the following subfunctions:

Additional function requirements for triggering an automatic emergency call 

Triggering of an automatic emergency call 

In the event of an accident with airbag deployment, an automatic emergency call is immediately sent out. An emergency call is sent out regardless of the severity of the accident. The telematics services communications module receives the crash information, including the crash level, from the supplemental restraint system control unit via the following path:

IMPORTANT The supplemental restraint system control unit transmits a readiness signal cyclically via the same route (e.g. every 500 ms). In this way, the telematics services communications module monitors the communication with the supplemental restraint system control unit and the correct operation of the crash detection.

An automatic emergency call is also triggered (redundant) if the telematics services communications module receives the "central locking emergency opening" signal and at the same time the cyclic readiness signal ("sign of lift") from the supplemental restraint system control unit is not received. The "Central locking emergency opening" signal is received by the telematics services communications module over the diagnostic CAN from the front SAM control unit with fuse and relay module.

Additional function requirements for triggering a manual emergency call 

Triggering of a manual emergency call 

The manual emergency call is triggered by pressing the emergency call system button. The emergency call system button is covered up with a locking flap. Pressing the protective lid unlocks the lid, and it automatically opens with the aid of a spring mechanism.

The telematics services communications module reads in the signals of the emergency call system button via a direct line.

Transmission of the emergency call data and communication with the Mercedes-Benz Service Center 

Once a manual or automatic emergency call has been triggered, the telematics services communications module sets up a voice connection with the Mercedes-Benz Service Center. Audio sources are muted, and existing telephone connections are interrupted. The status of the connection setup is indicated by the following messages on the Audio/COMAND display:

As soon as a connection to the Mercedes-Benz Service Center is established, the telematics services communications module automatically transmits two SMS messages using Message Access Profile (MAP). The text messages contain the following information:

Once the text messages have been transmitted, the voice connection is set up. The telematics services communications module first sends a shortened data telegram using the dual tone multiple frequency (DTMF) via the voice connection. Then the user is contacted by a service receptionist from the Mercedes-Benz Service Center.

IMPORTANT During an automatic emergency call, the accept/terminate phone call button on the multifunction steering wheel is temporarily disabled while the connection is being set up in order to avoid unintentional termination. Pressing the Accept/terminate phone call button 2 times briefly in succession can interrupt the automatic emergency call.

Additional telematics services (MB Connect) 

The telematics services of the emergency call system are realized via a mobile radio connection to the Service Center. The telematics services communications module transmits and receives the mobile phone signals via the emergency call system antenna. The following services, e.g. are available:

IMPORTANT MODEL 212 as of 3/2/15

as of model year 2016

with CODE 350 (Ecall emergency call system, Europe, gen. 3)

with CODE B54 (Live Traffic Information)

without CODE 347 (Ecall emergency call system, Europe)

without CODE 348 (Emergency call/assistant system)

without CODE 359 (TELE AID emergency call system)

The real-time traffic data service is described in the document titled, "Navigation mode, function".

With all services, vehicle data is transmitted to the Service Center. The services towing service, breakdown assistance and some service and maintenance functions can be used when the customer selects the telephone book entry "MB Contact" via the audio equipment. The telematics services communications module establishes a voice connection to the Service Center via the emergency call system antenna and transmits vehicle data. The telematics services communications module receives the request for establishing a voice connection from the audio equipment via the following route:

With the service and maintenance service, if there is no customer contract for service and maintenance, a pop-up window appears on the Audio/COMAND display in the vehicle 5 days before a calculated service is due, via which the system asks whether to establish a connection to the customer center. If the customer selects "Call now", a voice connection is established to the Service Center. If the customer selects "Call later", the pop-up window is displayed again later. If the customer selects "No, thank you", no pop-up window is displayed when the service is due. The telematics services communications module forwards the data for displaying the pop-up window to the audio equipment via the following route:

The audio equipment sends the picture signals over an low voltage differential signaling line to the Audio/COMAND display. With the service and maintenance with customer contract service and the App services (with CODE 531 (COMAND APS)), contact between the customer and the Service Center is established independently of the vehicle (e.g. via the Internet or via the mobile phone) and the Service Center queries vehicle data or transmits control signals to the vehicle.

IMPORTANT App services are e.g. transferring the vehicle location ("Vehicle Finder"), transmitting the vehicle location, as soon as the vehicle has reached or leaves a certain area ("Vehicle Tracker/Geofencing"), remote door unlocking and locking ("Remote Lock/Unlock"), display of the vehicle status ("Remote Status").

The telematics services communications module receives the vehicle data via the diagnostic CAN from the front SAM control unit with fuse and relay module and transmits received operating requests via the diagnostic CAN to the front SAM control unit with fuse and relay module.

  Electrical function diagram for manual or automatic emergency call function   PE82.95-P-2066-97DAD
  Overview of system components, telematics   GF82.85-P-9999FLA 
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