Emergency call system control unit, component description - GF82.95-P-3212CAU
MODEL 207 with CODE (359) TELEAID emergency call system
Illustrated on model 207.3
Location
The emergency call system control unit is located in the trunk under the trunk mat on the crossmember.
Task
The emergency call system control unit has the following tasks:
- 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
Realization of following vehicle-related services:
- Authorization
- - Manual or automatic emergency call, including police emergency call number "911"
- MB information call
- Roadside assistance
- Vehicle tracking
- Vehicle remote unlocking
- Vehicle remote locking
Regulation of priorities via integrated priority management
| Priority | Service |
|---|---|
| 1 | Automatic emergency call |
| 2 | Manual emergency call |
| 3 | Vehicle tracking |
| 4 | Roadside assistance |
| 5 | MB information call |
| 6 | Authorization |
| 7 | Vehicle remote door unlock or vehicle remote door lock |
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 (S93/3), 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 service center and actuation of trunk lid external operation switch (S88/8) 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 ("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
Signals are read in via the following connections:
- Direct lines
- CAN
Direct lines
- Status signal for circuit 15R
- Emergency call system button signal
- MB info button signal
- - Breakdown assistance button signal via a direct line
- Global Positioning System (GPS) signals from multifunction antenna (A28/11) via global positioning system antenna splitter (A2/5) (with code (512) COMAND APS with DVD changer or code (527) COMAND APS with single DVD drive (with navigation))
- Crash signal from supplement restraint system control unit
- Signal from hands-free system microphone (A67b1) via COMAND controller unit (A40/3)
- Mobile telephone signals from multifunction antenna via a coaxial cable
- Mobile phone signals from emergency call system antenna (A2/52)
CAN
The emergency call system control unit receives signals via diagnostic CAN (CAN D). The functions that use these signals are described in the individual function descriptions.
Transmit signals
The signals are transmitted via the following connections:
- Direct lines
- CAN
Direct lines
- Actuating signal for LED in emergency call button
- Actuating signal for LED in MB info button
- Actuating signal for LED In breakdown assistance button
- 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)
- Wake-up signal to COMAND controller unit
- Voice output via center instrument panel speaker
- Mobile phone signals to multifunction antenna via coaxial cable
- Mobile phone signals to emergency call system antenna
CAN
The emergency call system control unit transmits the signals via diagnostic CAN
The functions that use these signals are described in the individual function descriptions.
Design
- Integrated communication module
- Integrated locating module
- Integrated GPS receiver for positioning finding (data, time, history and last known location)
- 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.
The emergency call system control unit generates the data telegram in the form of an SMS if one of the following vehicle-related services is activated:
- - Manual or automatic emergency call, including police emergency call number "911"
- 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 two American mobile telephone networks: the analog Advanced Mobile Phone Service (AMPS) network and the digital Code Division Multiple Access network ("CDMA network"). For data communication in the AMPS network, the communication module is also equipped with a modem.
Properties:
- "CDMA Class 3": f = 800 MHz with P = 0.2 W transmitter output
- "CDMA Class 2": f = 1900 MHz with P = 0.1 W transmitter output
- "AMPS": f = 800 MHz
- SMS
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.
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 activation a self-diagnosis is performed and the result sent to the "controller"
| Technical data Designation |
Unit | Values | Tolerance range | Remarks |
|---|---|---|---|---|
| Emergency call system control unit | ||||
| Power supply | V | 13 | ±1 | (UB) accomplished over circuit 15R |
| Voltage limits | V | 9 | ±1 | Minimum (UBmin ) |
| V | 16 | ±1 | Maximum (UBmax ) | |
| Power consumption | μA | ≤360 | Sleep mode (unit deactivated, "Circuit 30 OFF"); (Advanced Mobile Phone Service (AMPS) and Code Division Multiple Access (CDMA)) Typical (Ityp ) |
|
| μA | 400 | Sleep Mode (unit deactivated, "Circuit 30 OFF"); (AMPS and CDMA) Maximum (Imax ) |
||
| mA | ≤3 | Stand-by mode (up to 4 days after "Circuit 15 OFF"; Network Access Device (NAD) activated); (AMPS and CDMA) Minimum (Imin .) |
||
| mA | 12 | Stand-by mode (up to 4 days after "Circuit 30 OFF"; NAD activated); (AMPS and CDMA) Maximum (Imax ) |
||
| mA | 500 | Idle mode (unit activated, without current service); (AMPS and CDMA) Typical (Ityp ) |
||
| mA | 600 | Idle mode (unit activated, without current service); (AMPS and CDMA) Maximum (Imax ) |
||
| mA | 800 | Normal mode (unit activated, with current service); (AMPS) Typical (Ityp ) | ||
| mA | 1700 | Normal mode (unit activated, with current service); (AMPS) Maximum (Imax ) |
||
| mA | 650 | Normal mode (unit activated, with current service); (CDMA) Typical (Ityp ) |
||
| mA | 1200 | Normal mode (unit activated, with current service); (CDMA) Maximum (Imax ) |
||
| mA | 650 | Send SMS Typical (Ityp ) |
||
| mA | 500 | Receiving SMS Typical (Ityp ) |
||
| Reverse polarity protection | The emergency call system control unit is protected for a period of t = 5 minutes against polarity reversal up to maximum U pol. rev.
= 36 V, without any damage. All inputs and outputs on the emergency call system control unit are resistant to short circuit. |
|||
| Additional specific parameters | None | |||
| Special features | The software of the emergency call system control unit processes its routines and commands independently of the connected components. The prioritization of the individual tasks is regulated by the emergency call system control unit. These priorities can be changed and defined only with the management information base (MIB). | |||
| Flash capability/coding capability | Yes/yes | |||
| Center instrument panel speaker | ||||
| Model | Speaker | |||
| Bandwidth | Hz | 250 to 10 000 | ||
| Emergency call system button, MB-Info button and breakdown assistance button | ||||
| Model | Button group with LEDs | |||
| Voltage | V | 12 | LED | |
| Resistor | Ω | ≈0 | Pushbutton operated | |
| Global positioning system antenna splitter | With code (512) COMAND APS with DVD changer or with code (527) COMAND APS with single DVD drive (with navigation) | |||
| Model | Antenna splitter | |||
| Frequency | MHz | 1574.4... 1576.447 |
From multifunction antenna | |
| Multifunction antenna | ||||
| Power supply | V | 12 | Operating voltage (UNom ) | |
| Quiescent current | mA | 1.2 | TypicalQuiescent ) | |
| mA | 1.5 | Maximum (IQuiescent ) | ||
| Wake-up | mA | 9 | With UB = 12 V (IWake-Up ) | |
| Reverse polarity protection | Polarity reversal protection up to UB = 15 V for a period of t = . | |||
| Additional specific parameters | The unit can withstand voltage peaks of UB = 27 V over a maximum period of t = 60 s, without suffering any damage. | |||
| Special features | ||||
| Amplifier output interference voltages | dBμV | 5 | AM maximum (UNoise ) | |
| dBμV | 8 | AM typical (UNoise ) | ||
| dBμV | 4 | FM maximum (UNoise ) | ||
| dBμV | 6 | FM typical (UNoise ) | ||
| Output | Ω | 50 | Characteristic impedance (ZA ) | |
| Flash capability/coding capability | n/a/n/A. | |||
| Emergency call system antenna | ||||
| Power supply | n/A. | |||
| Quiescent current | n/A. | |||
| Additional specific parameters | n/A. | |||
| Special features | n/A. |
| Wiring diagram for emergency call system control unit | N123/4 | PE82.95-P-2101-97EAA |