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

MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)

Fig 1: Emergency Call System Block Diagram - Shown On Model 218

Courtesy of MERCEDES-BENZ USA

Shown on model 218 as of 1.3.13

Fig 2: Emergency Call System Block Diagram - Shown On Model 218

Courtesy of MERCEDES-BENZ USA

Shown on model 218 up to 28.2.13

Function requirements, emergency call system, general

Terminal 30
Transport mode not active
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

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

The emergency call system control unit receives the "Terminal 15R" message from the electronic ignition lock control unit via the following route:

Interior CAN
Front SAM control unit with fuse and relay module
Diagnostic CAN

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.

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 information call
Roadside assistance
Notification in the event of antitheft alarm ("Anti Theft Notification")
Tracking ("stolen vehicle tracking")
Vehicle remote unlocking
Vehicle remote locking
Remote diagnosis ("Remote Diagnosis")
Transmission of vehicle position ("Vehicle Locator")
Notification of a certain speed being exceeded ("Speed Alert")
Notification if a certain area has been reached or left ("Geo Fencing")
Transmission of information (e.g. navigation data) to the vehicle ("Remote Information Feed")
Transmission of updates to vehicle ("Remote Update")
Visual and acoustic vehicle recognition ("Flash Lights and Sound Horn")
Internet connection (with CODE 512 (COMAND APS with DVD changer) or with CODE 531 (COMAND APS) or with CODE 522 (Audio 20 radio))

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

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

Emergency call system status indication
Telephone antenna selection
Voice connection between vehicle and Service Center
Position finding
Data from the Supplemental Restraint System control unit
Manual or automatic emergency call

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

The other subfunctions are described in :

Additional telematics services function
Internet connection function

The Internet connection (with CODE 512 (COMAND APS with DVD changer) or with CODE 531 (COMAND APS) or with CODE 522 (Audio 20 radio)) is not controlled via the emergency call system control unit but the audio equipment.

Emergency call system status indication

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

Status indication through light-emitting diodes
Status indication in instrument cluster
Status indication on the Audio/COMAND display

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

Status indication through light-emitting diodes

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 actuates the LEDs of the emergency call system button, the MB info button and the breakdown assistance button via direct lines.

Status indication 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:

Diagnostic CAN
Front SAM control unit with fuse and relay module
Interior CAN

Status indication on the 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 emergency call system control unit transmits the text message or the pop-up window to the Audio/COMAND display via the following route:

Diagnostic CAN
Front SAM control unit with fuse and relay module
Interior CAN
Audio unit
LVDS line

Additional function requirements for selecting the 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 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

One of the following vehicle-related services is present:
- Manual or automatic emergency call
- MB information call
- Roadside 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. 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.

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:

Steering wheel electronics
Steering LIN
Steering column module control unit
Chassis CAN 1
Front SAM control unit with fuse and relay module
Chassis CAN 2
Instrument cluster
Interior CAN
Front SAM control unit with fuse and relay module
Diagnostic CAN

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:

Steering wheel electronics
Steering LIN
Steering column module control unit
Chassis CAN
Instrument cluster
Interior CAN
Front SAM control unit with fuse and relay module
Diagnostic CAN

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:

GPS position finding
Basic position finding

Additional function requirement for GPS position finding

Circuit 15R ON or activation of an authorized service

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, in vehicles with CODE 512 (COMAND APS with DVD changer), with CODE 531 (COMAND APS) or with CODE 522 (Audio 20 radio) and with CODE 357 (SD card navigation) via the Global Positioning System antenna splitter.

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

Circuit 15R ON

Basic position finding

For basic position finding the emergency call system control unit requires wheel speed and yaw rate signals from the Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except model 218.374) or from the Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS) or model 218.374). The Electronic Stability Program control unit or the Premium Electronic Stability Program control unit transmits the signals to the emergency call system control unit via the following route:

Chassis CAN 1 (as of 1.3.13) or chassis CAN (up to 28.2.13)
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 current vehicle position (longitude and latitude) is then calculated in the emergency call system control unit.

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.

Additional function requirement 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 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.

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

Chassis CAN 1 (as of 1.3.13) or chassis CAN (up to 28.2.13)
Front SAM control unit with fuse and relay module
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 goal of the emergency call are the following points:

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

For a manual or an automatic emergency call, the Service Center can transfer the data for navigation to the vehicle if required. The data is made available to the navigation module of the audio equipment.

The emergency call function consists of the following subfunctions:

Triggering of a manual emergency call
Triggering of an automatic emergency call
Transmission of the emergency call data and communication with the Service Center

Additional function requirements for triggering a manual emergency call

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

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.

The signal of the emergency call system button is looped through in the overhead control panel control unit (N70).

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:

Chassis CAN 1 (as of 1.3.13) or chassis CAN (up to 28.2.13)
Front SAM control unit with fuse and relay module
Diagnostic CAN

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:

Vehicle position, direction of travel and history
Vehicle data and crash information

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

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

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 executed by SMS if one of the four services with the highest priority is activated and the remaining connection resources are released for the prioritized service.
Services without SMS capability or an Internet connection are terminated if one of the four services with the highest priority is activated and the connection resources are released for the prioritized service.
The remote diagnosis has its own data channel, and can also be carried out for every other service.
The four services with the highest priority are executed if no service with a higher priority is active.

Services with SMS capability are:

Tracking ("stolen vehicle tracking")
Vehicle remote unlocking
Vehicle remote locking
Notification of a certain speed being exceeded ("Speed Alert")
Notification if a certain area has been reached or left ("Geo Fencing")
Visual and acoustic vehicle recognition ("Flash Lights and Sound Horn")

The four services with the highest priority are listed below.

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	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	PE82.95-P-2061-97XAA
	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	PE82.95-P-2061-97XAB
Electrical function diagram for manual or automatic emergency call, function	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	PE82.95-P-2066-97XAA
	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	PE82.95-P-2066-97XAD
Electrical function diagram for voice connection between vehicle and Service Center, function	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	PE82.95-P-2069-97XAA
Electrical function diagram for position finding, function	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	PE82.95-P-2070-97XAA
Electrical function diagram for position finding, function	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	PE82.95-P-2070-97XAB
Overview of system components, telematics	MODEL 218.3 as of model year 2013 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	GF82.85-P-9999FQA
Additional telematics services function	MODEL 218.3 with CODE 348 (Emergency call/assistant system) without CODE 347 (Ecall emergency call system, Europe) without CODE 350 (Ecall emergency call system, Europe, gen. 3) without CODE 359 (TELE AID emergency call system)	GF82.95-P-2025FQV