Emergency Call System, Function - GF82.95-P-0004LFU
Model 217, 222
with code 348 (Emergency call/assistant system)
except code 347 (Mercedes-Benz emergency call system)
Shown on model 222
Show on model 217
Function requirements, emergency call system, general
- Circuit 30
- Transport mode not active
- Each vehicle-related service is authorized separately.
- The communication module of the emergency call system control unit is configured with the telephone number of the relevant service provider.
- The vehicle owner is registered and authorized at the Service Center.
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 anti-theft 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")
- Transmitting information, (e.g. map 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
The emergency call system control unit is not used for regular telephone calls.
The emergency call system function consists initially of the following subfunctions:
- Self-diagnosis
- 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
The Internet connection is not controlled via the emergency call system control unit, but via the COMAND controller unit.
Information on prioritization of services will be provided at the end of this document.
Self-diagnosis
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 runs a self-diagnosis (approx. 8 to 10 s). The light-emitting diodes of the SOS button, the MB-Info button and the breakdown assistance button are on for approx. 10 s.
The emergency call system control unit receives the "Circuit 15R" message via the diagnostic CAN from the electronic ignition lock control unit. After a successful self-diagnosis, the emergency call system is operational and the light-emitting diodes go out.
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 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 SOS button, the MB-Info button and the breakdown assistance button are used to display the following states:
- Self-diagnosis of emergency call system, LEDs light up for approx. 10 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.
- Diagnosis
The emergency call system control unit actuates the LEDs in the SOS button, the MB-Info button and the breakdown assistance button via the following route:
Diagnostic CAN →
Electronic ignition lock control unit →
Interior CAN →
Front SAM control unit →
Roof LIN →
Overhead control panel control unit
Status indication 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 by the emergency call system control unit via the following route:
Diagnostic CAN →
Electronic ignition lock control unit →
User interface CAN →
Instrument cluster
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 message or the pop-up window is displayed by the emergency call system control unit via the following route:
Diagnostic CAN →
Electronic ignition lock control unit →
User interface CAN →
COMAND controller unit →
LVDS line →
Audio/COMAND display
Additional function requirements for selecting the telephone antenna
- Defective multifunction antenna (model 222) or telematics services antenna (model 217) or poor reception
Telephone antenna selection
Under normal circumstances, the communications module integrated in the emergency call system control unit sends and receives all mobile phone signals via multifunction antenna (model 222) or via telematics services antenna (model 217). If reception is poor or if the multifunction antenna (model 222) or the telematics services antenna (model 217) is defective, the communications module integrated in the emergency call system control unit automatically sends and receives the mobile phone signals over the emergency call system antenna splitter and the left emergency call system antenna or the right emergency call system antenna.
The emergency call system control unit monitors the multifunction antenna (model 222) or the telematics services antenna (model 217) via a direct line and detects the failure or poor reception. The emergency call system control unit then automatically sends or receives the cellular telephone system signals for each vehicle-related service over the emergency call system antenna splitter and the left or right 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, an SMS is sent to the Service Center. This message contains the vehicle position, customer and vehicle identification data and other vehicle data ("Initial Summary"). Then the user can speak to a service receptionist via the existing voice connection.
The hands-free system microphone is used for the voice input. The signals from the hands-free system microphone are sent to the COMAND controller unit, where they are looped through and forwarded to the communications 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 communications module integrated in the emergency call system control unit sends and receives the mobile phone signals via multifunction antenna (model 222) or telematics services antenna (model 217).
In the event of a failure of the multifunction antenna (model 222) or the telematics services antenna (model 217) or if reception is poor, the emergency call system control unit automatically sends and receives the mobile phone signals over the emergency call system antenna splitter and the left or right emergency call system antenna.
The establishment of a voice connection to the Service Center is interrupted by the communication module integrated into the emergency call system control unit after several unsuccessful dialing attempts. The cancellation of the connection setup is indicated by a corresponding message in the instrument cluster as well as on the audio/COMAND display. Voice output solely occurs over the center instrument panel speaker (except code 811 (Advanced sound system)) or over the center instrument panel midrange speaker (with code 811 ((Advanced sound system)). The center instrument panel speaker or the center instrument panel midrange speaker is actuated over direct lines by the emergency call system control unit.
For all other applications (e.g. audio mode) the center instrument panel speaker or the center instrument panel mid-range speaker and all other speakers installed depending on equipment are muted by a mute signal from the emergency call system control unit. In vehicles except code 810 (Sound system) and except code 811 (Advanced sound system), the mute signal is sent over a direct line to the COMAND controller unit. In vehicles with code 810 (Sound system) or code 811 (Advanced sound system), the mute signal is sent over a direct line to the sound system amplifier control unit. Normally, the voice connection is terminated by the Service Center or by the user.
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.
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 (after interruption of satellite reception) may require several minutes (for initial commissioning of the emergency call system control unit up to 20 minutes). 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 over the global positioning system antenna splitter from the multifunction antenna (model 222) or the GPS antenna (model 217). The emergency call system control unit calculates the current position of the vehicle (recipient) from the GPS signals. 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.
The wheel speed and yaw rate signals are transferred via the following route:
Chassis FlexRay →
Electronic ignition lock control unit →
Diagnostic CAN →
Emergency call system control unit
The emergency call system control unit uses the data to calculate the current vehicle position (longitude and latitude).
Position finding errors, 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 the seat occupancy LIN as a digital crash signal from the supplemental restraint system control unit.
The crash information, including crash level, is also (redundantly) sent via the following route:
User interface CAN →
Electronic ignition lock control unit →
Diagnostic CAN →
Emergency call system control unit
The supplemental restraint system control unit transmits a "LIFE" signal ("sign of life" of 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.
These emergency calls are made for the following reasons:
- 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
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 COMAND controller unit.
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. The signal from the accept/terminate phone call button is transmitted via the following route:
Steering wheel electronics →
Steering LIN →
Steering column tube module control unit →
Chassis FlexRay →
Electronic ignition lock control unit →
User interface CAN →
Instrument cluster
The signal from the accept/terminate phone call button is transferred by the instrument cluster via the following route:
User interface CAN →
Electronic ignition lock control unit →
Diagnostic CAN →
Emergency call system control unit →
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 SOS button. The SOS 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 SOS button signals are read in via the following route:
Overhead control panel control unit →
Roof LIN →
Front SAM control unit →
Interior CAN →
Electronic ignition lock control unit →
Diagnostic CAN →
Emergency call system control unit
Triggering of an automatic emergency call
The emergency call system control unit receives a crash signal from the supplemental restraint system control unit via the seat occupancy LIN. At the same time, the crash signal (redundantly) and the crash level are transferred by the supplemental restraint system control unit via the following route:
User interface CAN →
Electronic ignition lock control unit →
Diagnostic CAN →
Emergency call system control unit
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 to the Service Center via the integrated communications module.
The SMS automatically sent to the Service Center contains the following data:
- Vehicle position, direction of travel and history
- Vehicle data and crash information
The communications module integrated in the emergency call system control unit sends and receives the mobile phone signals via multifunction antenna (model 222) or telematics services antenna (model 217).
In the event of a manual or automatic emergency call, other vehicle-related services (e.g. MB-Info call) are interrupted.
In the event of a failure of the multifunction antenna (model 222) or the telematics services antenna (model 217) or if reception is poor, the emergency call system control unit automatically sends and receives the mobile phone signals over the emergency call system antenna splitter and the left or right emergency call system 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 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 data recording for remote diagnosis has its own data channel and it can be conducted in addition to any 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 in the following table.
| Priority | Service |
|---|---|
| 1 | Automatic emergency call |
| 2 | Manual emergency call |
| 3 | Roadside assistance |
| 4 | MB Info |
MB-Info and breakdown assistance can be converted into a higher priority service by pressing the button of this higher priority service without the voice connection being interrupted. An MB-Info call is converted to a manual emergency call, for example, if the SOS button is pressed during an active MB-Info call.
| Electrical function diagram for status display of emergency call system, function | Model 222 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2061-97SEA | |
| Model 217 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2061-97SEC | ||
| Electrical function diagram for manual or automatic emergency call, function | Model 222 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2066-97SEA | |
| Model 217 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2066-97SEC | ||
| Electrical function diagram for voice connection between vehicle and Service Center, function | Model 222 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2069-97SEA | |
| Model 217 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2069-97SEC | ||
| Electrical function diagram for position finding, function | Model 222 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2070-97SEA | |
| Model 217 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) | PE82.95-P-2070-97SEC | ||
| Additional telematics services function | GF82.95-P-2025LFU | ||
| Overview of system components, telematics | Model 217, 222 up to model year 2018 with code 348 (Emergency call/assistant system) except code 347 (Mercedes-Benz emergency call system) |
GF82.85-P-9999LF |