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

GF82.95-P-3212CEU 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 behind the seats in the trunk.

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
^ Receive signals
^ Transmitting signals

Depending on the equipment installed one of the following control units will be installed, hereafter referred to as the "audio unit":
- Radio (A2), with code (523) MB Audio 20 radio or with code (510) Audio 20 with CD changer
- COMAND controller unit (A40/3), with code (512) COMAND APS with DVD changer

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 via 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 supplemental restraint system control unit (N2/10), for automatic emergency call
- Actuation of emergency call system button (S93/3), for manual emergency call
- Actuation of MB-Info button (S93/6s1), for MB-Info call
- Actuation of breakdown assistance button (S93/6s2), for breakdown assistance
- Call to the service center and actuation of the trunk lid external operation switch (S88/8) (model 204.0) or liftgate external operation switch (S88/8) (model 204.9), for vehicle remote door unlock
- Call to service center and reporting of theft for vehicle tracking

Audio management
- Output of audio signals via center instrument panel speaker (H4/27)
- Audio muting

Display management
- Management of displays on the Audio/COMAND display (A40/8), instrument cluster (A1), emergency call system button, MB-Info button and breakdown assistance 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, a fault message is displayed on the instrument cluster, depending on the fault type, and the two red light-emitting diodes (LED) in the emergency call system button are permanently actuated. Depending on the fault type, the fault is also stored in the emergency call system control unit's memory.

Receive 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
- Emergency call system button signal via a direct line
- MB-Info button signal via a direct line
- Breakdown assistance button signal via a direct line
- Crash signal from the supplemental restraint system control unit via a direct line
- Signal from voice control system microphone (B25/7) through the "audio equipment" via direct lines
- Mobile phone signals or data from the multifunction antenna (A28/11) via a coaxial cable, except code (389) Mobile phone preinstallation with universal interface, USA/ Canada
- Mobile phone signals or data from the frequency switchover control unit (N96) via a coaxial cable, with code (389) Mobile phone preinstallation with universal interface, USA/Canada
- Global positioning system (GPS) signals from multifunction antenna
- Mobile phone signals or data from emergency call system antenna (A2/52)

CAN
- Diagnostic CAN (CAN-D) low
- Diagnosis CAN-High

The emergency call system control unit is a diagnostic CAN subscriber. The emergency call system control unit receives the crash data from the supplemental restraint system control unit and also (redundantly), including crash level, via the following route:
- Chassis CAN (CAN-E)
- Front SAM control unit with fuse and relay module (/)N10/1
- Diagnostic CAN

Transmitting signals

Direct lines
- Voice output through center instrument panel speaker via direct lines
- Actuation signal for LEDs in emergency call system button via a direct line
- Actuation signal for LED in MB-Info button switch via direct line
- Actuation signal for LED in breakdown assistance button via a direct line
- Audio muting (MUTE) over discrete line:
- Sound system amplifier control unit (N40/3), with code (810) Sound system
- "Audio unit", except code (810) Sound system

- Mobile phone signals or data from the multifunction antenna via a coaxial cable, except code (389) Mobile phone preinstallation with universal interface, USA/Canada
- Mobile phone signals or data from the frequency switchover control unit (N96) via a coaxial cable, with code (389) Mobile phone preinstallation with universal interface, USA/Canada
- Wake-up signal to the "audio unit"
- Mobile phone signals or data to the emergency call system antenna

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 a multifunction antenna malfunction (e.g. defective because of rollover) the emergency call system control unit automatically uses the emergency call system antenna to receive and transmit mobile phone signals or data.