GF82.95-P-3212LEU Emergency Call System Control Unit, Component Description

GF82.95-P-3212LEU Emergency Call System Control Unit, Component Description
- with CODE (359) TELE AID emergency call system

Component Identification:

Location
The emergency call system control unit is located in the front left of the trunk at the rear panel.

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
- Vehicle remote door lock

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
7 Vehicle remote locking

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 restraint 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 Telediagnosis button (S93/6s2), for breakdown assistance
- Call to service center and actuation of trunk lid external operation switch (S88/8), for vehicle remote door unlock and lock
- Call to service center and reporting of theft for vehicle tracking

Audio management
- Muting the audio sources (MUTE)
- Output of audio signals on the center cockpit speaker (Centerfill) (H4/27)

Display management
- Display management on the COMAND display (A40/8), in the instrument cluster (A1), in the SOS push button, in the MB-Info button or in the telediagnosis button

Treatment of fault
After activation of circuit 15R, the emergency call system control unit performs a self-test (for approx. t = 3.5 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
- Telediagnosis button signal over discrete line
- Digital crash signal from restraint systems control unit via a direct line
- Signals from the hands-free system microphone group (A67b1) via the voice control system (VCS [SBS]) control unit (N41/3) via direct lines
- Mobile radio signals and data from the GPS and telephone roof antenna (A2/49) via the frequency switchover control unit (N96) and a coaxial cable, model 221
- Mobile radio signals and data from the emergency call antenna (A2/52) via a coaxial cable, model 216
- GPS signals from the GPS antenna (A2/49a2) via the antenna splitter (A2/5) and a coaxial cable, model 216
- GPS signals from the GPS and telephone roof antenna via the antenna splitter and a coaxial cable, model 221
- Mobile radio signals or data from the emergency call system left backup antenna (A2/54) and the emergency call system right backup antenna (A2/55) via the emergency call system antenna splitter (A2/25) and a coaxial cable

The emergency call antenna is integrated in the GPS antenna in model 216.

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 redundantly including crash level via the following route:
- Chassis 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 LEDs in SOS push button via a direct line
- Actuation signal for LED in MB-Info button switch over discrete line
- Actuation signal for LED in Telediagnosis button switch over discrete line
- Audio muting (MUTE) via a direct line to the audio tuner control unit (N93/1)
- Mobile radio signals and data to the GPS and telephone roof antenna via the frequency switchover control unit and a coaxial cable, model 221
- Mobile radio signals and data to the emergency call antenna via a coaxial cable, model 216
- Mobile phone signals or data to the emergency call system left backup antenna and to the emergency call system right backup antenna
- Wake-up signal to the COMAND controller unit

The emergency call antenna is integrated in the GPS antenna in model 216.

Design
- Integrated communication module with NAD
- Integrated locating module
- Integrated Global Positioning System (GPS) receiver for position finding (date, time, history and last-known location) for the 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

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"

If the telephone and GPS roof antenna, model 221, or the emergency call antenna, model 216, fails (e.g. malfunction caused by rollover) the emergency call system control unit transmits and receives the mobile radio signals and data via the following route in order to transfer mobile radio signals and mobile radio data:
- Direct line
- Emergency call system antenna splitter
- Direct line
- Emergency call system left backup antenna
- Emergency call system right backup antenna

The emergency call antenna is integrated in the GPS antenna in model 216.