Emergency Call System Control Unit, Component Description - GF82.95-P-3212RRU
Model 190
With Code 348 (Emergency call/assistant system)
Shown On Model 190
Location
The emergency call system control unit is located in the trunk at the right sidewall on a bracket.
Tasks
- Realization of vehicle-related services
- Regulation of priorities via integrated priority management
- Communication management between vehicle and service center
- Audio management
- Display management
- Error handling
- Receive signals
- Transmitting signals
Realization of vehicle-related services
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")
- Transmission of information (e.g. map data) to the vehicle ("Remote Information Feed")
- Transmission of updates to vehicle ("Remote Update")
- Services with short message service (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 in the following table.
- Visual and acoustic vehicle recognition ("Flash Lights and Sound Horn")
- Internet connection
The Internet connection is not controlled through the emergency call system control unit, but through the head unit (A26/17).
The emergency call system control unit is not used for regular telephone calls.
Regulation of priorities via integrated priority management
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:
| Priority | Service |
|---|---|
| 1 | Automatic emergency call |
| 2 | Manual emergency call |
| 3 | Roadside assistance |
| 4 | MB Info |
Communication management between vehicle and service center
The emergency call system control unit controls communication between the vehicle and the Service Center via the integrated communication module and the mobile telephone network, and establishes a voice connection with the driver if necessary. In many cases (e.g. breakdown assistance, MB Info call) the connection setup with the Service Center also includes the transmission of an SMS containing the vehicle position, identification data and other vehicle data ("Initial Summary").
Audio management
- Emitting of audio signals over the emergency call speaker (H4/48) (except CODE 810 (Sound system) or except CODE 811 (Advanced sound system)) or over the center instrument panel midrange speaker (H4/27) (with CODE 810 (Sound system) or with CODE 811 (Advanced sound system))
- Muting of audio sources (mute function)
Display management
Management of function-specific displays on Audio/COMAND display (A40/8), in the instrument cluster (A1), in the SOS button (N70/3s5), in the breakdown assistance button (N70/3s10) and in the MB-Info button (N70/3s11).
Error handling
After activation of circuit 15R, the emergency call system control unit performs a self-diagnosis. If the self-diagnosis test is successful, the emergency call system is then operational. In the event of a fault, a fault message is displayed on the instrument cluster depending on the fault type, and the two red light-emitting diodes (LED) in the SOS button are permanently actuated. Depending on the fault type, the fault code is also stored in the emergency call system control unit's fault memory.
Receive signals
- Direct lines
- CAN
- Integrated radio interface for wireless local area network (WLAN)
Direct lines
The emergency call system control unit receives the following signals over direct lines:
- Power supply via circuit 30 and circuit 31
- Crash signal from the Supplemental Restraint System control unit (N2/10)
- Signals from driver hands-free system microphone (B25/26) via the head unit
- Mobile radio and Internet signals from the telephone antenna splitter (A2/109) over a coaxial cable
- Global Positioning System (GPS) signals from GPS antenna (A2/23), in vehicles with CODE 531 (COMAND APS) over the Global Positioning System antenna splitter (A2/5)
- Mobile radio and Internet signals from emergency call system antenna (A2/52)
CAN
The emergency call system control unit is a diagnostic CAN (CAN D) subscriber. The emergency call system control unit receives signals such as the following from the front SAM control unit with fuse and relay module (N10/1) via diagnostic CAN:
- Circuit 15R ON
- Crash information from the Supplemental Restraint System control unit (redundant), including crash level
- Operation of the SOS button, the MB-Info button and the breakdown assistance button
- Rotational speed and yaw rate signals from Electronic Stability Program control unit (N30/4)
- Vehicle data (for "Initial Summary")
- Diagnostic data (with remote diagnosis)
Integrated radio interface for wireless local area network (WLAN)
The emergency call system control unit receives radio signals for Internet communication, which the head unit transmits over the WLAN antenna (A2/83).
Transmitting signals
- Direct lines
- CAN
- Integrated radio interface for wireless local area network (WLAN) (With Code 531 (COMAND APS))
Direct lines
CAN
The emergency call system control unit transmits the following signals:
- Actuation signal for LEDs in the SOS button, the MB Info button and the breakdown assistance button
- Navigation and miscellaneous data sent by the Service Center ("Remote Information Feed") to the head unit
The emergency call system control unit transmits the following signals:
- Voice output through the emergency call speaker (except CODE 810 (Sound system) or except CODE 811 (Advanced sound system)) or over the center instrument panel midrange speaker (with CODE 810 (Sound system) or with CODE 811 (Advanced sound system))
- Muting of audio sources to the sound system amplifier control unit (N40/3) (with code 810 (Sound system)), to the advanced sound system amplifier control unit (N40/7) (with code 811 (Advanced sound system)) or to the head unit (except code 810 (Sound system) and except code 811 (Advanced sound system))
- Mobile radio signals to the telephone antenna splitter over a coaxial cable
- Mobile phone signals to emergency call system antenna
- Status signals to the head unit
- Status signals to the instrument cluster
Integrated radio interface for wireless local area network (WLAN) (With Code 531 (COMAND APS))
The emergency call system control unit transmits Internet data as radio signals to the WLAN antenna.
Body
- Integrated Internet-compatible communications module with radio interface for wireless local area network (WLAN)
- Integrated locating module
- Integrated GPS receiver for position finding (date, time, history and last-known location) for the listed vehicle-related services
- Memory for vehicle-specific data
- Buffer for navigation and other data that is transmitted to the vehicle
- Plastic housing
Function
The emergency call system control unit centrally processes all the vital data for the listed vehicle-related services. The emergency call system control unit has its own microprocessor. A distinction is made between the following subareas:
- Position finding module
- Communications module
Position finding module
The emergency call system control unit uses the installed positioning module to calculate the position of the vehicle and, if necessary, generates a message to the Service Center or a data telegram ("Initial Summary") in the form of an SMS.
Communications module
The communication module integrated into the emergency call system control unit is a mobile phone transceiver enabling voice and data communication with the Service Center via mobile phone frequencies. Communication takes place via the digital Code Division Multiple Access (CDMA) network. Other functions of the communications module are:
- Four day transmission and reception capability: As soon as an SMS is received, the emergency call system control unit is also activated (wake-up); after four days the emergency call system goes into "sleep mode".
- After circuit 15 ON a self-diagnosis test is conducted.
If reception is poor or if the left telephone antenna (A2/102), right telephone antenna (A2/103) or the telephone antenna splitter malfunctions (e.g. defective due to rollover or side impact), the emergency call system control unit automatically uses the emergency call system antenna to send and receive mobile radio signals.
| Wiring diagram for emergency call system control unit | PE82.95-P-2101-97FBA |