GF82.95-P-3212RDU Component Description For Emergency Call System Control Unit
GF82.95-P-3212RDU Component Description For Emergency Call System Control Unit
MODEL 172.4
- with CODE (359) TELE AID emergency call system
N123/4 Emergency call system control unit
Location
The emergency call system control unit is located in the trunk under the trunk mat on the crossmember.
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
^ Fault handling
^ Receive signals
^ Transmit 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")
- Vehicle tracking
- Vehicle remote unlocking
- Vehicle remote locking
- Transmission of navigation data ("Remote Destination Feed")
Regulation of priorities via integrated priority management
Priority Service
1 Automatic emergency call
2 Manual emergency call
3 Vehicle tracking and notification in the event of anti- theft alarm
4 Roadside assistance
5 MB Info
6 Authorization
7 Vehicle remote door unlock or vehicle remote door lock
8 Transmission of navigation data
Communication management between vehicle and service center
Communication management between vehicle and service center over integrated communication module and national mobile telephone network as well as transmission of information to driver if required.
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 (S93/3s2), for manual emergency call
- Actuation of breakdown assistance button (S93/3s4), for breakdown assistance
- Actuation of MB-Info button (S93/3s5), for MB-Info call
- Call to Service Center and actuation of trunk lid external operation switch (S88/8), for remote door unlocking
- Call to Service Center, for remote door locking
- Call to Service Center and reporting of theft for vehicle tracking
- Notification in the event of anti-theft alarm
- Transmission of navigation data
- Authorization ("provisioning")
Audio management
- Output of audio signals via the emergency call speaker (H4/48), with vehicles except code (810) Sound system, or via the center instrument panel speaker (H4/27), in vehicles with code (810) Sound system.
- Audio muting (MUTE)
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
Fault handling
After activation of circuit 15R, the emergency call system control unit performs a self-test (for approx. t = 4 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 31
- Crash signal from supplemental restraint system control unit
- Signal from inside rearview mirror system microphone (A67b1) via COMAND controller unit (A40/3)
- Mobile telephone signals from multifunction antenna (A28/11) via coaxial cable
- Mobile phone signals from emergency call system antenna (A2/52)
- Global positioning system (GPS) signals from multifunction antenna via global positioning system antenna splitter (A2/5) (with code (512) COMAND APS incl. DVD changer)
Controller Area Network (data bus/CAN bus) (CAN)
The emergency call system control unit is a diagnostic CAN subscriber (CAN D). The emergency call system control unit receives the following signals via this CAN from the front SAM control unit with fuse and relay module (N10/1):
- Crash information from the supplemental restraint system control unit (redundant), including crash level
- Operation of the emergency call system button (S93/3s2), the MB info button (S93/3s5) and the breakdown assistance button (S93/3s4)
- Rpm signals from Electronic Stability Program control unit (N30/4)
Transmit signals
^ Direct lines
^ CAN
Direct lines
- Voice output via the emergency call speaker (H4/48) (except code (810) Sound system) or the center instrument panel speaker (H4/27) (with code (810) Sound system)
- Audio muting to following control units:
- Sound system amplifier control unit (N40/3) (with code (810) Sound system)
- COMAND controller unit (without code (810) Sound system)
- Mobile phone signals to multifunction antenna via coaxial cable
- Mobile phone signals to emergency call system antenna
CAN
- Actuation signal for light-emitting diodes in the emergency call system button
- Actuating signal for LED in MB Info button
- Actuating signal for LED in breakdown assistance button
- Status signals to the COMAND controller unit
- Status signals to the instrument cluster
Design
- Integrated communication module
- 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
- Screened metal housing
Function
The emergency call system control unit has its own microprocessor. A differentiation is made between the two subareas of the communication module 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
- Vehicle tracking and notification in the event of anti-theft alarm
- MB information call
- Roadside assistance
- Vehicle remote unlocking
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 over mobile phone frequencies. This supports communication via the digital Code Division Multiple Access (CDMA) network.
Other functions of the communication module are:
- Four day transmission and reception capability, as soon as an SMS is received, the emergency call system control unit is activated (wake-up); after four days the emergency call system reverts to the "sleep mode"
- Following circuit 15 ON, a self-test is performed.
In the event of insufficient reception or failure of the multifunction antenna (e.g. defect caused by rollover), the emergency call system control unit automatically uses the emergency call system antenna to receive and transmit the mobile radio signals.
