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

MODEL 166.0 

with CODE (359) TELE AID emergency call system 

up to model year 2013 

/AEJ 12 

Function requirements 

• 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

Self-test 

If the emergency call system control unit receives the "Circuit 15R" message from the electronic ignition lock control unit via the diagnostic CAN, the emergency call system control unit runs a self test (approx. t = 3.5 s). The LEDs on the emergency call system button, the MB-lnfo 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-lnfo 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:

• Authorization ("provisioning")
• Manual or automatic emergency call
• MB information call
• Roadside assistance
• Notification in the event of antitheft alarm ("Anti Theft Notification")
• Vehicle tracking
• Vehicle remote unlocking
• Vehicle remote locking
• Transmission of navigation data ("Remote Destination Feed")

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

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

• Display of emergency call system status Telephone antenna selection 
• Voice connection between vehicle and Service Center 
• Data from Supplemental Restraint System (SRS) control unit 
• Manual or automatic emergency call 

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 

Display of emergency call system status 

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

• 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-lnfo 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 actuates the LEDs of the emergency call system button in the following way:

• Diagnostic CAN
• Electronic ignition switch control unit
• Interior CAN
• SAM control unit
• Roof LIN
• Overhead control panel control unit
• Direct line

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
• Electronic ignition switch control unit
• Chassis CAN 2

Display of status on Audio/COMAND display 

An active emergency call system service is indicated by a text message or a pop-up (with confirmation prompt) on the Audio/COMAND display.

Actuation of light-emitting diodes for emergency call system status 

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 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 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.

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

• Diagnostic CAN
• Electronic ignition switch control unit
• Interior CAN
• COMAND control unit
• LVDS line

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-lnfo call
  • Breakdown assistance
  • Vehicle tracking

Voice connection between vehicle and Service Center 

Regardless of the type of vehicle-related service initiated (e.g. MB- lnfo 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 via the existing voice connection.

The handsfree system microphone group integrated into the inside rearview mirror (A67), is used for voice input. The signals from the handsfree system microphone group are routed via a direct line to the COMAND controller unit. In the COMAND controller unit, the signals from the handsfree system microphone group are only looped through and are forwarded 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 handsfree system microphone group 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:

• Direct line
• Multifunction antenna

Voice output on vehicles with code (810) Sound system is effected solely through the center instrument panel speaker and on vehicles except code (810) Sound system solely through the emergency call speaker. Each speaker is actuated via direct lines from the emergency call system control unit.

For all other applications (e.g. audio mode), the center instrument panel speaker (with code (810) Sound system) and all other equipment-specific installed speakers are muted through a mute signal from the emergency call system control unit over a direct line to the sound system amplifier control unit (with code (810) Sound system) or to the COMAND controller unit (except code (810) Sound system).

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 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.

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 operated for the first time). Basic position finding runs parallel to GPS position finding. The position finding function consists of the following component functions:

• Function sequence for GPS position finding 
• Basic position finding function sequence 

GPS position finding function requirements 

• Circuit 15R ON or activation of an authorized service

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:

• Direct line
• Global Positioning System antenna splitter and direct line

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 wheel speed signals are recorded by the following rpm sensors:

• Left front axle speed sensor
• Right front axle speed sensor

The wheel speed signals, including the direction of travel, are received by the emergency call system control unit via the following route:

• Electronic Stability Program control unit
• Chassis CAN 1
• Electronic ignition switch control unit
• Diagnostic CAN

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

• Chassis CAN 2
• Electronic ignition switch control unit
• Diagnostic CAN

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.

Error during 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 

• 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 1
• Electronic ignition switch control unit
• Diagnostic CAN

The Supplemental Restraint System control unit transmits a "LIFE" signal ("sign of life" for Supplemental Restraint System (SRS) 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 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. The purposes of these emergencies calls are as follows:

• Automatic alerting of the rescue services after an accident
• Alerting of rescue workers at the press of a button (own emergency situation, observed accident)
• Reduction in 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 reads in the signals from the emergency call system button via the following path:

• Direct line
• Overhead control panel control unit
• Roof LIN
• SAM control unit
• Interior CAN
• Electronic ignition switch control unit
• Diagnostic CAN

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 1
• Electronic ignition switch control unit
• 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 travel and history
• Vehicle data and crash information

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

• Direct line
• Multifunction antenna

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

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 antitheft alarm
4	Roadside assistance
5	MB Info
6	Authorization
7	Vehicle remote door unlock or vehicle remote door lock
8	Transmission of navigation data

	Electrical function diagram for status display of emergency call system, function		PE82.95-P-2061-97NAA
	Electrical function diagram for voice connection between vehicle and service center, function		PE82.95-P-2069-97NAA
	Electrical function diagram for position finding function		PE82.95-P-2070-97NAA
	Electrical function diagram for manual or automatic emergency call, function		PE82.95-P-2066-97NAA
	Additional telematics services function		GF82.95-P-2025GRU
	Overview of system components, telematics		GF82.85-P-9999GR