Emergency call system control unit, component description - GF82.95-P-3212GQU
MODEL 164.1 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008 model refinement package
MODEL 164.8 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008
MODEL 251.0 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008
MODEL 251.1 with CODE (359) TELE AID emergency call system as of model year 2009/Modification Year 2008
Shown on model 164.1, with code (512) COMAND APS with DVD changer
Location
On model 164, the emergency call system control unit is located on the left beneath the rear bench seat.
On model 251, the emergency call system control unit is located in the footwell below the 2nd row of seats.
Task
- Realization of vehicle-related services
- Regulation of priorities over integrated priority management
- Communication management between vehicle and service center
- Forwarding vehicle position and identification as well as other required data to the service center
- Audio management
- Display management
- Treatment of fault
- Receiving signals
- Transmitting signals
Realization of vehicle-related services
- Realization of following vehicle-related services:
- Authorization (provisioning)
- Emergency call (E-Call) manual or automatic, including police emergency call number "911"
- MB-Info call
- Breakdown assistance (Roadside Assistance)
- Vehicle tracking
- Vehicle remote door unlock
Regulation of priorities over integrated priority management
| Priority | Service |
|---|---|
| 1 | Automatic alarm call |
| 2 | Manual emergency call |
| 3 | Vehicle tracking |
| 4 | Roadside assistance |
| 5 | MB information call |
| 6 | Authorization |
| 7 | Vehicle remote unlocking |
Communication management between vehicle and service center
- Communication management between the vehicle and the service center over the integrated communication module with Network Access Device (NAD) control and specific national mobile phone network as well as, if required, forwarding information to the customer
Forwarding vehicle position and identification as well as other required data to the service center
- Forwarding vehicle position and identification as well as other required data to the service center after activation by the following actions:
- Crash signal from restrain systems control unit (N2/7), for automatic emergency call
- Actuation of SOS pushbutton switch (S93/3), for manual emergency call
- Actuation of MB-Info button (S93/6s1), for MB-Info call
- Actuation of Tele-diagnosis button (S93/6s2), for breakdown assistance
- Call to service center and actuation of rear-end door handle switch (S88/9), for vehicle remote door unlock
- Call to service center and reporting of theft for vehicle tracking
Audio management
- Output of audio signals on the center cockpit speaker (Centerfill) (H4/27)
- Audio muting
Display management
- Display management on the COMAND operating, display and control unit (A40/3), in the instrument cluster (A1) and in the SOS pushbutton switch, MB-Info button and Tele-diagnosis button
Treatment of fault
After activation of circuit 15R, the emergency call system control unit performs a self-test (for approx. 4 s). If the self-test is successful, the emergency call system is then ready for operation.
In the event of a fault or if authorization has not been provided, a fault message is displayed on the instrument cluster, depending on the type of fault and the two red light-emitting diodes (LED) in the SOS pushbutton switch are actuated continuously. Depending on the fault type, the fault is also stored in the emergency call system control unit's memory.
Receiving signals
- Direct lines
- Controller Area Network (data bus/CAN bus) (CAN)
Direct lines
- Power supply via circuit 30 and circuit 31g over one discrete line each
- Status signal circuit 15R over discrete line
- SOS pushbutton switch over discrete line
- MB-Info button signal over discrete line
- Tele-diagnosis button signal over discrete line
- Crash signal from restraint systems control unit over discrete line
- Signal from the hands-free system microphone group (A67b1) over the COMAND operating, display and controller unit and a direct line
- Mobile phone signals and data from TELE AID antenna (A2/93a4) over coaxial cable
- Global Positioning System (GPS) signals from GPS antenna (A2/93a6) via GPS antenna splitter (with code (512) COMAND APS with DVD changer)
- Mobile phone signals and data from TELE AID backup antenna (A2/50)
CAN
- Diagnostic CAN low
- Diagnosis CAN-High
The emergency call system control unit is a diagnostic CAN subscriber. The emergency call system control unit receives the crash information from the restraint systems control unit and in addition (redundantly) including crash level over the following path:
- Engine compartment CAN
- Central gateway control unit (N93)
- Diagnostic CAN
Transmitting signals
Discrete lines
- Voice output on center cockpit speaker (Centerfill) over discrete line
- Actuation signal for LED in SOS pushbutton switch over discrete line
- Actuation signal for LED in MB-Info button switch over discrete line
- Actuation signal for LED in Tele-diagnosis button switch over discrete line
- Audio mute (MUTE) via a direct line to the following control units:
- Amplifier for sound system (N40/3), with code (810) Sound system
- COMAND operating, display and controller unit, except code (810) Sound system
- Mobile phone signals and data to TELE AID antenna over coaxial cable
- Wake-up signal to COMAND operating, display and controller unit
Design
- Integrated communication module with NAD
- Integrated locating module
- Integrated GPS receiver for position finding (Date, time, history and last known location) for listed vehicle-related services
- Memory for vehicle-specific data
- Shielded metal housing
Function
The emergency call system control unit has its own microprocessor. A differentiation is made between the 2 subareas of the communication module with NAD and the locating module. The emergency call system control unit centrally processes all the vital data for the listed vehicle-related services.
The emergency call system control unit uses the installed locating module to calculate the vehicle position and generates a data telegram in the form of an SMS when one of the following vehicle-related services has been activated:
- Manual or automatic emergency call, including police emergency call number "911"
- MB-Info call
- Breakdown assistance
- Vehicle remote door unlock
Communication module with NAD
The communication module with NAD integrated into the emergency call system control unit is a mobile phone transceiver enabling voice and data communication with the service center over mobile phone frequencies. This supports communication via the two American mobile telephone networks: the analog Advanced Mobile Phone Service (AMPS) network and the digital Code Division Multiple Access (CDMA) network. For data communication in the AMPS network, the communication module with NAD is also equipped with a modem.
Listed below are the properties of the AMPS and CDMA networks:
- CDMA Class 3, 800 MHz with 0.2 W transmitting power
- CDMA Class 2, 1900 MHz with 0.1 W transmitting power
- AMPS 800 MHz
- SMS
Additional communication module with NAD functions are:
- 4 day transmission and reception capability, as soon as an SMS is received, the emergency call system control unit is activated (wake-up); after 4 days the emergency call system reverts to the "sleep mode"
- Following activation a self-diagnosis is performed and the result sent to the "controller"
In the event of failure of the TELE AID antenna (e.g. defective due to rollover), the emergency call system control unit automatically uses the TELE AID backup antenna for reception and transmission of the mobile phone signals and data.
| Wiring diagram for emergency call system control unit | Model 164 | PE82.95-P-2101-99MAA | |
| Model 251 | PE82.95-P-2101-99RAA |