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Emergency Call System, Function - GF82.95-P-0004CEU

MODEL 204.0 with CODE (359) TELEAID emergency call system as of model year 2009/YoM 08 

MODEL 204.3/9 with CODE (359) TELEAID emergency call system 

Fig 1: Emergency Call System Block Diagram
G10084769Courtesy of MERCEDES-BENZ USA

Function requirements 

Self-test 

If the emergency call system control unit receives the message "terminal 15R" over the diagnostic CAN from the electronic ignition lock control unit, the emergency call system control unit runs a self test (approx. t = 5s). The LEDs on the emergency call system button, the MB-Info button and the breakdown assistance button go on for approx. 5 s. After a successful self test the emergency call system is then operational and the LEDs go off.

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.

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.

Further subfunctions are described in a separate document:

Display of emergency call system status 

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

IMPORTANT When remotely locking the vehicle, a system-specific status indication is not issued.

Display 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 controls the LEDs in the emergency system button, the MB info button and the breakdown assistance button via direct lines.

Display of status in instrument cluster 

The status of the emergency call system is indicated in a text message in the instrument cluster in the following instances:

The message is displayed in the instrument cluster by the emergency call system control unit in the following way:

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 (with confirmation prompt) on the Audio/COMAND display.

The message or the pop-up on the Audio/COMAND display is displayed by the emergency call system control unit via the following way:

Actuation of light-emitting diodes for emergency call system status 

Fig 2: Identifying Emergency Call System Status Graph
G10084770Courtesy of MERCEDES-BENZ USA

Function requirements for selecting telephone antenna 

Telephone antenna selection 

Normally, the communication module integrated into the emergency call system control unit sends and receives all mobile phone signals over 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 over the emergency call system antenna.

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

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. After feedback by the Service Center with a special tone, an SMS is sent to the Service Center with the appropriate data including the vehicle identification number (VIN). Then the driver can speak to a service receptionist over the existing voice connection.

The hands-free system microphone is used for voice commands; it is integrated into the inside rearview 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 integrated into the emergency call system control unit transmits and receives the mobile phone signals via the following route:

Voice output takes place exclusively via the center instrument panel speaker. The center instrument panel speaker is controlled by the emergency call system control unit via direct lines.

The speaker in the middle of the instrument panel and all other speakers installed depending on the equipment are muted for all other applications (e.g. audio mode). Muting is accomplished by a mute signal from the emergency call system control unit over direct line to the sound system amplifier control unit (with code (810) Sound system) or to the audio equipment (except code (810) Sound system).

Normally, the voice connection is terminated by the Service Center or by the driver.

IMPORTANT In the event of an emergency call the voice connection can only be terminated by the Service Center.

IMPORTANT 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.

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 sends and receives the mobile phone signals via the emergency call system antenna.

Position finding 

For position finding, the emergency call system control unit uses the satellite-supported global positioning system (GPS). It is available worldwide. The GPS satellites permanently transmit time and position data (longitude and latitude). GPS position finding is irretrievable after vehicle transport (e.g. by train or ferry or after towing).

Relocation with GPS (after interruption of satellite reception) may require several minutes (up to t = 20 min when emergency call system control unit is operated for the first time). Basic position finding runs parallel to GPS position finding.

The position finding function consists of the following component functions:

GPS position finding function requirements 

Function sequence for GPS position finding 

The GPS receiver integrated into the emergency call system control unit receives the GPS signals from the multifunction antenna via the following route:

The GPS signals are used by the emergency call control unit to calculate the current vehicle position (receiver).

In addition, the vehicle's direction of travel is determined with the aid of the sequence of the locations calculated with GPS.

Basic position finding function requirements 

Basic position finding function sequence 

For basic position finding, the emergency call control unit requires the following information:

The emergency call system control unit receives the wheel speed signals from the Electronic Stability Program control unit via the following path:

The distance traveled data is received by the emergency call system control unit from the instrument cluster via the following route:

The direction of travel data (forwards or backwards) is received by the emergency call system control unit via the diagnostic CAN from the front SAM control unit with fuse and relay module. After this the emergency call system control unit uses the distance traveled, the vehicle alignment and the direction of travel to calculate the vehicle position (degree of longitude and degree of latitude) at any given time.

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.

Function requirements for data from supplemental restraint system control unit 

Data from supplemental restraint system control unit 

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

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

The emergency call system control unit also (redundantly) receives the crash information, including crash level via the following route:

IMPORTANT The supplemental restraint system control unit sends a "LIFE" signal (from supplemental restraint system control unit) every t = 500 ms over the same path as the crash information incl. "Crash level". This allows the emergency call system control unit to permanently monitor communication with the supplementary restraint system 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. The purposes of these emergencies calls are as follows:

IMPORTANT Improper actuation of a manual or automatic emergency call is punishable by law.

IMPORTANT For a manual or an automatic emergency call the Service Center can transfer the navigation data to the vehicle if required. The data are made available to the navigation module of the COMAND controller unit (with code (512) COMAND APS with DVD changer).

The emergency call function consists of the following subfunctions:

D Function sequence for activating an automatic emergency call 

D Function sequence for transmission of emergency call data and communication with the Service Center 

Function requirements for activating a manual emergency call 

Function sequence for activating a manual emergency call 

Actuation of the emergency call system button with the inscription "SOS" for at least 2 seconds actuates the manual emergency call. 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 directly reads in the emergency call system button via a direct line.

Function sequence for activating 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.

Simultaneously, 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:

Function sequence for transmission of 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 sends an SMS with the following data to the Service Center via the integrated communication module:

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

The communication module integrated into the emergency call system control unit transmits and receives the mobile phone signals via the following route:

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.

Prioritization 

The emergency call system control unit has a priority management feature to ensure that it does not have to manage several services at the same time. This determines the point at which a service is to be activated and which service has a higher priority. Depending on which service is to be activated, the emergency call system control unit enables resources according to the priority list. A required service is not activated if at this point in time a higher-priority vehicle-specific service is already active.

Automatically completing an emergency call has the highest priority.

Priority Service
1 Automatic emergency call
2 Manual emergency call
3 Vehicle tracking and notification in the event of anti-theft alarm
4 Roadside assistance
5 MB Info
6 Authorization
7 Vehicle remote door unlock or vehicle remote door lock
8 Transmission of navigation data
REFER TO SYSTEM WIRING DIAGRAMS Electrical function diagram for status display of emergency call system, function   PE82.95-P-2061-97FAA
REFER TO SYSTEM WIRING DIAGRAMS Electrical function diagram for voice connection between vehicle and service center, function   PE82.95-P-2069-97FAA
REFER TO SYSTEM WIRING DIAGRAMS Electrical function diagram for position finding, function   PE82.95-P-2070-97FAA
REFER TO SYSTEM WIRING DIAGRAMS Electrical function diagram for manual or automatic emergency call, function   PE82.95-P-2066-97FAA
  Additional telematics services function   GF82.95-P-2025CEU 
  Overview of system components, telematics   GF82.85-P-9999CE 
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