Emergency call system control unit, component description - GF82.95-P-3212FQU
MODEL 218 with CODE (359) TELEAID emergency call system
Shown with code (512) COMAND APS with DVD changer
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
Realization of following vehicle-related services:
- Authorization
- Manual or automatic emergency call
- 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/liftgate 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
- Direct lines
- CAN
Direct lines
- Emergency call system button signal
- MB info button signal
- Breakdown assistance button signal
- Crash signal from supplemental restraint system control unit
- Signal from hands-free system microphone (A67b1) via COMAND controller unit (A40/3)
- Mobile telephone signals from multifunction antenna (A28/11) via coaxial cable
- Global Positioning System (GPS) signals from the multifunction antenna over the Global Positioning System antenna splitter (A2/5) (with code (512) COMAND APS with DVD changer or with code (527) COMAND APS with single DVD drive (with navigation))
- Mobile phone signals from emergency call system antenna (A2/52)
CAN
The emergency call system control unit is a diagnostic CAN subscriber (CAN D). 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
The emergency call system control unit receives information on the wheel speeds from the Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS and without model 218.374) or from the Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS or model 218.374) over the following path:
- Chassis CAN
- Front SAM control unit with fuse and relay module
- Diagnostic CAN
Transmit signals
- Voice output via center instrument panel speaker
- 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)
- Sound system amplifier control unit (N40/3)
- Mobile phone signals to multifunction antenna via coaxial cable
- Phone on signal to COMAND controller unit
- Mobile phone signals to emergency call system antenna
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
- 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 American mobile telephone networks and the digital Code Division Multiple Access (CDMA) network.
Properties of the CDMA network:
- 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
- SMS
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"
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.
| 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 | ≤400 | Sleep mode (device is deactivated, "Circuit 30 OFF"), at 25 °C | |
| μA | ≤533 | Sleep mode (device is deactivated, "Circuit 30 OFF"), at -30..85 °C | ||
| mA | ≤12 | Idle mode (since the device occasionally wakes up in this mode, current spikes can occur) | ||
| mA | ≤600 | Normal mode | ||
| A | ≤3 | Calling mode (device is activated, with active service) | ||
| Reverse polarity protection | The emergency call system control unit is resistant to polarity reversal for a time of t = 5 min. up to a maximum voltage of Upol. revers
= -36 V, without 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 | |||
| Emergency call speaker or center instrument panel speaker | ||||
| Model | Speaker | |||
| Bandwidth | Hz | 250...10 000 | ||
| 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 to 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 | Protected against polarity reversal up to UB = 15 V for a time of t = ∞. | |||
| Additional specific parameters | The unit withstands voltage spikes of UB = 27 V for a maximum time of t = 60 s, without 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-2101-97XAA |