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Home >> Mercedes Benz >> 2012 >> CLS 550 4MATIC (218.391) V8-4.6L Turbo (278.922) >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Accessories and Optional Equipment >> Emergency Contact Module >> Description and Operation

Emergency Contact Module: Description and Operation




GF82.95-P-3212FQU Emergency Call System Control Unit, Component Description
MODEL 218
- with CODE (359) TELEAID emergency call system





Shown with code (512) COMAND APS with DVD changer
A2/5 Global positioning system antenna splitter
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
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 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
^ Controller Area Network (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 handsfree 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 code (527) COMAND APS with single DVD drive (with navigation))
- Mobile phone signals from emergency call system antenna (A2/52)

Controller Area Network (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
In addition, the emergency call system receives information on the wheel speeds from the Electronic Stability Program control unit (N30/4) (without code (233) DISTRONIC PLUS, without model 218.374) or the Electronic Stability Program Premium control unit (N30/7) (with code (233) DISTRONIC PLUS, or model 218.374) via the following route:
- Chassis CAN
- Front SAM control unit
- 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)
- 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 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.




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