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

MODEL 212 with CODE 348 (Emergency call/assistant system) 

Shown on model 212 as of 1.3.13 

Fig 1: Emergency Call System Function Diagram - Shown On Model 212 As Of 1.3.13
G10050591Courtesy of MERCEDES-BENZ USA

Shown on model 212 up to 28.2.13 

Fig 2: Emergency Call System Function Diagram - Shown On Model 212 Up To 28.2.13
G10050592Courtesy of MERCEDES-BENZ USA

Function requirements, emergency call system, general 

Emergency call system, general 

The emergency call system control unit enables the following vehicle-related services to be realized:

IMPORTANT The emergency call system control unit is not used for regular telephone calls.

The emergency call system function consists initially of the following subfunctions:

IMPORTANT Information on prioritization of services will be provided at the end of this document.

The other subfunctions are described in separate documents:

IMPORTANT The Internet connection is not controlled through the emergency call system control unit, but rather through the audio equipment.

Selftest 

If the emergency call system control unit receives the "Circuit 15R" message from the electronic ignition lock control unit, the emergency call system control unit performs a self-test (approx. 8 to 10 s). The light-emitting diodes of the emergency call system button, the MB-Info button and the breakdown assistance button are on for approx. 10 s. The emergency call system control unit receives the "Terminal 15R" message from the electronic ignition lock control unit via the following route:

After a successful self-test, the emergency call system is operational and the light-emitting diodes go out.

IMPORTANT In the event of a fault, a fault message (depending on the fault type) appears on the instrument cluster, and the LEDs on the emergency call system button, the MB-Info button and the breakdown assistance button are permanently illuminated. Depending on the fault type, the fault is also stored in the emergency call system control unit's fault memory.

Display of emergency call system status 

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

IMPORTANT With some services, no system-specific status indication takes place in the vehicle.

Display of status through LEDs 

The LEDs for the emergency call system button, the MB-Info button and the breakdown assistance button are used to display the following status:

The emergency call system control unit actuates the light-emitting diodes of the emergency call system button, the MB-Info button, and the breakdown assistance button.

Display of status in instrument cluster 

The status of the emergency call system is displayed in the form of a text message on the instrument cluster in the event of an active service or a fault in the emergency call system. The emergency call system control unit transmits the message to the instrument cluster via the following route:

Display of status on Audio/COMAND display 

An active service of the emergency call system is indicated by a text message or a pop-up window (with confirmation prompt) on the Audio/COMAND display. The message or the pop-up window on the Audio/COMAND display is displayed by the emergency call system control unit as follows:

Additional function requirements for selecting the telephone antenna 

Telephone antenna selection 

Normally, the communication module integrated into the emergency call system control unit transmits and receives all mobile phone signals via the multifunction antenna. In the event of poor reception or a defective multifunction antenna, the communication module integrated into the emergency call system control unit automatically transmits and receives the mobile phone signals via the emergency call system antenna.

The emergency call system control unit monitors the multifunction antenna via a direct line, and detects the failure or poor reception. The emergency call system control unit then automatically transmits or receives the mobile phone signals for each vehicle-related service via a direct line and the emergency call system antenna.

Additional function requirements for voice connection between vehicle and Service Center 

Voice connection between vehicle and Service Center 

Regardless of the type of vehicle-related service initiated (e.g. MB-Info call), a voice connection is established to the Service Center. Following feedback from the Service Center via a special tone, a Short Message Service (SMS) message is transmitted to the Service Center. This message contains the vehicle position, customer and vehicle identification data and other vehicle data ("Initial Summary"). Then the driver can speak to a service receptionist via the existing voice connection.

The hands-free system microphone is used for voice commands; it is integrated into the inside rear view mirror (A67). The signals of the hands-free system microphone are relayed via a direct line to the audio equipment. The audio unit then loops through the signals from the hands-free system microphone and forwards them to the communication module integrated into the emergency call system control unit. The communication module integrated into the emergency call system control unit then transmits the hands-free system microphone signals to the Service Center.

The communication module of the emergency call system control unit transmits and receives the mobile phone signals via the multifunction antenna.

IMPORTANT In the event of a malfunction in the multifunction antenna (e.g. defective because of a rollover), the communication module integrated into the emergency call system control unit automatically transmits and receives the mobile phone signals via the emergency call system antenna.

The buildup of a voice connection to the Service Center is terminated by the communication module integrated into the emergency call system control unit after several unsuccessful dialing attempts and a corresponding message is shown in the instrument cluster as well as on the Audio/COMAND display.

The center instrument panel speaker is actuated by the emergency call system control unit for voice output. For all other applications (e.g. audio mode), the speaker system is muted by a mute signal from the emergency call system control unit via a direct line to the sound system amplifier control unit (with CODE 810 (Sound system) or CODE 811 (Advanced sound system)) or to the audio equipment (without CODE 810 (Sound system) or CODE 811 (Advanced sound system)). Normally, the voice connection is terminated by the Service Center or by the driver.

If there is an emergency call, the voice connection can only be terminated by the Service Center or by pressing the accept/terminate phone call button in the "Hang up" subfield for at least 15 s.

As of 1.3.13 the emergency call system control unit receives the signals of the accept/terminate phone call button via the following route:

Up to 28.2.13 the emergency call system control unit receives the signal of the accept/terminate phone call button via the following route:

Position finding 

The emergency call system control unit 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). Relocating with GPS may take several minutes (in the event of initial startup of the emergency call system control unit or after interruption of satellite reception).

Basic position finding runs parallel to GPS position finding.

The position finding function consists of the following component functions:

Additional function requirement for GPS position finding 

GPS position finding 

The GPS receiver integrated in the emergency call system control unit receives the GPS signals either directly from the multifunction antenna or via the global positioning system antenna splitter for the following vehicles:

The GPS signals are used by the emergency call control unit to calculate the current vehicle position (receiver). The vehicle's direction of travel is also determined using the sequence of GPS calculated locations.

Additional function requirement for basic position finding 

Basic position finding 

For basic position finding, the emergency call system control unit needs wheel speed and yaw rate signals from one of the following components:

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 instances, the deviation is automatically corrected by the navigation processor integrated into the emergency call system control unit when it receives GPS data.

The Electronic Stability Program control unit, the Electronic Stability Program Premium control unit or the regenerative braking system control unit transmits the signals to the emergency call system control unit via the following route:

The current vehicle position (longitude and latitude) is then calculated in the emergency call system control unit.

Additional function requirement for data from the supplemental restraint system control unit 

Data from the Supplemental Restraint System control unit 

In the event of an accident with airbag deployment, an automatic emergency call (E-Call) is made immediately. An emergency call is sent out regardless of the severity of the accident.

The emergency call system control unit receives the crash information via a direct line as a digital crash signal from the supplemental restraint system control unit.

In addition (redundant), the emergency call system control unit receives the crash data incl. crash level via the following route from the supplemental restraint system control unit:

IMPORTANT The supplemental restraint system control unit uses the same route as for the crash data incl. crash level to send, every 500 ms, a "LIFE" signal ("life signal" from the supplemental restraint system control unit). This allows the emergency call system control unit to permanently monitor communication with the supplemental restraint unit control unit and proper function of the crash recognition.

Manual or automatic emergency call 

In the event that a driver is confronted with an emergency situation while in a remote location, a Service Center employee can obtain an overview of the situation inside the vehicle with the aid of the data received from the emergency call system control unit (voice connection and SMS) and initiate the appropriate action required for help. An emergency call be initiated manually or automatically. These emergency calls are made for the following reasons:

The emergency call function consists of the following subfunctions:

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 marked "SOS". 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 emergency call system control unit reads in the emergency call system button signals via a direct line.

Triggering of an automatic emergency call 

The emergency call system control unit receives a crash signal from the supplemental restraint system control unit via a direct line.

At the same time, the emergency call system control unit receives the crash signal (redundant) and the crash level from the Supplemental Restraint System control unit via the following route:

Transmission of the emergency call data and communication with the Service Center 

After a manual or automatic emergency call has been initiated, the emergency call system control unit establishes a voice connection to the Service Center. After the Service Center replies with a special tone, the emergency call system control unit automatically transmits an SMS with the following data to the Service Center via the integrated communication module:

The communications module integrated in the emergency call system control unit transmits and receives the mobile phone signals directly via the multifunction antenna.

IMPORTANT In the event of a manual or automatic emergency call, other vehicle-related services (e.g. MB Info call) are interrupted.

IMPORTANT If the multifunction antenna malfunctions or the reception quality is poor, the emergency call system control unit automatically sends and receives the mobile phone signals over the emergency call system antenna.

IMPORTANT If connection to the Service Center cannot be established when an automatic emergency call is initiated, a voice connection is automatically set up using the emergency number whereupon the listed data then has to be communicated verbally.

IMPORTANT MODEL 212 as of 3/2/15

as of model year 2016

with CODE 348 (Emergency call/assistant system)

MODEL 212 up to 3/1/15

up to model year 2016

with CODE 348 (Emergency call/assistant system)

with CODE 512 (COMAND APS with DVD changer)

MODEL 212 up to 3/1/15

up to model year 2016

with CODE 348 (Emergency call/assistant system)

with CODE 527 (COMAND APS with single DVD drive (with navigation))

With a manual or an automatic emergency call, the Service Center can transfer the map data to the vehicle if required. The data is made available to the navigation module of the audio equipment. Data transfer to the audio equipment is described in the document titled, "Additional telematics services".

Prioritization 

The emergency call system control unit can manage a voice or data connection and an SMS connection at the same time. The data connection can be used by several services simultaneously by means of transmitting data packets at staggered times. The priority management is based on the following principles:

Services with SMS capability are:

The four services with the highest priority are listed in the following table.

Priority Service
1 Automatic emergency call
2 Manual emergency call
3 Roadside assistance
4 MB Info
  Electrical function diagram for status display of emergency call system function   PE82.95-P-2061-97DAA
  Electrical function diagram for manual or automatic emergency call function   PE82.95-P-2066-97DAA
  Electrical function diagram for voice connection between vehicle and Service Center function   PE82.95-P-2069-97DAA
  Electrical function diagram for position finding function   PE82.95-P-2070-97DAA
  Additional telematics services function Tracking and notification in the event of a break-in and theft warning, breakdown assistance, MB-Info, remote door unlocking, remote door locking, remote diagnosis, vehicle position transmission, notification if a certain speed has been exceeded, notification if a certain area has been entered or exited, transmission of information (e.g. navigation data) to vehicle, transmission of updates to the vehicle, visual and acoustic vehicle recognition GF82.95-P-2025FLV 
  Overview of system components, telematics   GF82.85-P-9999FLA 
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