Emergency call system, function

P82.95-2964-79

Function requirements, emergency call system, general

 Terminal 30

 Each vehicle-related service is authorized separately

 An emergency call system control unit communication module authorized for the corresponding vehicle-related service is configured with the telephone number of the corresponding service provider

 The vehicle owner is registered and authorized at the Service Center

 The emergency call system with code (359) TELEAID emergency call system is installed in vehicles up to 31.5.2012. The emergency call system control unit is not used for regular telephone calls.

Emergency call system, general

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

- Authorization ("provisioning")

- Manual or automatic emergency call

- MB-Info call

- Breakdown assistance

– Notification in the event of antitheft alarm ("Antitheft Notification")

- Vehicle tracking

- Vehicle remote door unlock

- Vehicle remote door lock

– Transmission of navigation data ("Remote Destination Feed")

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

 Selftest

 Display of emergency call system status

 Telephone antenna selection

 Voice connection between vehicle and Service Center

 Data from the supplemental restraint system control unit

 Manual or automatic emergency call

 Prioritization

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

Further subfunctions are described in a separate document:

 Additional telematics services function

Selftest

If the emergency call system control unit receives the "Terminal 15R" message from the electronic ignition lock control unit via the diagnostic CAN, the emergency call system control unit runs a self test (approx. 5 s). 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.

 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 displayed in various ways. A distinction must be made between:

 Display of status through LEDs

 Display of status in instrument cluster

 Display of status on Audio/COMAND display

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

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:

– Emergency call system self-test, LEDs light up for approx. 5 s

– Active service, each LED flashes on and off

– Fault in emergency call system, LEDs permanently on

– System readiness of emergency call system, LEDs are off

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:

– Active service

– Fault in emergency call system

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

– Diagnostic CAN

– Front SAM control unit with fuse and relay module

– Interior CAN

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 is displayed on the Audio/COMAND display by the emergency call system control unit via the following route:

– Diagnostic CAN

– Front SAM control unit with fuse and relay module

– Interior CAN

-COMAND controller unit

- LVDS line

P82.95-2676-11

Function requirements for selecting telephone antenna

 Defect in multifunction antenna or poor reception

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 communications module integrated in the emergency call system control unit automatically sends and receives the mobile phone signals via 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 transmits or receives the mobile phone signals for each vehicle-related service via a direct line and the emergency call system antenna.

Function requirements for voice connection between vehicle and Service Center

 One of the following vehicle-related services is present:

- Manual or automatic emergency call

- MB-Info call

- Breakdown assistance

- Vehicle tracking

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. Once feedback has been received from the Service Center in the form of a special tone, an SMS is sent to the Service Center containing the appropriate data, including the vehicle identification number. 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 rearview mirror (A67). The signals from the hands-free system microphone are routed over a direct line to the COMAND controller unit. In the COMAND controller unit, the signals from the hands-free system microphone are only looped through and are forwarded to the communication module integrated into the emergency call system control unit.

Then the communications module that is integrated in the emergency call system control unit sends the signals of the hands-free system microphone to the Service Center. The communications module that is integrated in the emergency call system control unit sends and receives the mobile phone signals from the multifunction antenna via a direct line.

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. For all other applications (e.g. audio mode), the center instrument panel speaker and all other speakers installed depending on the equipment are muted. Muting is carried out by means of 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 the COMAND controller unit (except code (810) Sound system).

 More detailed information on the speaker system is available in the "Speaker output function" document.

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

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

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

 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.

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 started up 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 sequence

 Basic position finding function sequence

GPS position finding function requirements

 Circuit 15R ON or activation of an authorized service

GPS position finding function sequence

The GPS receiver integrated in the emergency call system control unit receives the GPS signals via the following route:

– Multifunction antenna

– Global positioning system antenna splitter (with code (512) COMAND APS with DVD changer or with code (527) COMAND APS with single DVD drive (with navigation))

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

 Circuit 15R ON

Basic position finding function sequence

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

- Wheel speed signals

- Distance traveled data

- Direction of travel data (forwards or backwards)

The emergency call system control unit receives the wheel speed signals via the following route:

– Electronic Stability Program control unit (except code (233) DISTRONIC PLUS) or Premium Electronic Stability Program control unit (with code (233) DISTRONIC PLUS)

– chassis CAN

– Front SAM control unit with fuse and relay module

– Diagnostic CAN

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

– Interior CAN

– Front SAM control unit with fuse and relay module

– Diagnostic CAN

The direction of travel data (forwards or backwards) is received by the emergency call system control unit via the diagnosis 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.

 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 the supplemental restraint system control unit

 Circuit 15R ON

Data from the 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 via 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:

– chassis CAN

– Front SAM control unit with fuse and relay module

– Diagnostic CAN

 The supplemental restraint system control unit sends a "LIFE" signal ("sign of life" for supplemental restraint system control unit) via the same route as the crash information, incl. "crash level", every t = 500 ms. This allows the emergency call system control unit to permanently monitor communication with the supplemental restraint system control unit and proper operation of the crash recognition.

Manual or automatic emergency call

If a driver is confronted with an emergency situation 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 appropriate remedial measures. An emergency call be initiated manually or automatically. The purpose of these emergency calls is as follows:

- Automatic alerting of the rescue services after an accident

- Alerting of rescue workings at the press of a button (own emergency situation, observed accident)

- Reduction of rescue times through fast emergency notification with details on exact location involved

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

 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:

 Function sequence for activating a manual emergency call

 Function sequence for activating an automatic emergency call

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

Function requirements for activating a manual emergency call

 A higher-priority vehicle-related service (automatic emergency call) is not active

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. 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:

– chassis CAN

– Front SAM control unit with fuse and relay module

– Diagnostic CAN

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 transmits an SMS with the following data to the Service Center via the integrated communication module:

- Vehicle position, direction of ravel and history

– Vehicle data and crash information

 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 in the emergency call system control unit transmits and receives the mobile phone signals via the multifunction antenna.

 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 activated, and which service has a higher priority. Depending on the service that 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 Breakdown assistance

5 MB-Info

6 Authorization

7 Remote door unlocking or remote door locking

8 Transmission of navigation data