Component Description For Emergency Call System Control Unit - GF82.95-P-3212GRU

MODEL 166 

up to model year 2016 

with CODE 359 (TELE AID emergency call system) 

without CODE 348 (Emergency call/assistant system) 

Location 

The emergency call system control unit is located underneath the left rear seat.

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
• Error handling
• Receive signals
• Transmitting 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 antitheft alarm ("Anti Theft Notification")
• Vehicle tracking
• Vehicle remote unlocking
• Vehicle remote locking
• Transmission of map data ("Remote Destination Feed")

Regulation of priorities via integrated priority management 

Priority service

1. Automatic emergency call
2. Manual emergency call
3. Tracking and notification in the event of anti-theft alarm
4. Breakdown assistance
5. MB-Info
6. Authorization
7. Remote door unlocking or remote door locking
8. Transmission of map 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/s4), for breakdown assistance
• Actuation of MB-Info button (S93/3s5), for MB-Info call
• Call to Service Center and actuation of liftgate 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 map data
• Authorization ("provisioning")

Audio management 

Receive signals 

• Output of audio signals through emergency call speaker (H4/48), on vehicles except CODE (810) Sound system, or through center instrument panel speaker (H4/27), on 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.

Error 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.

• Direct lines 
• Controller Area Network (data bus/CAN bus) (CAN) 

Direct lines 

• Power supply via circuit 30 and circuit 31
• Crash signal from supplement restraint system control unit
• Signal from the hands-free system microphone group (A67b1) over the COMAND controller unit (A40/3)
• Mobile phone signals from multifunction antenna (A28/11) over a coaxial cable
• Global positioning system (GPS) signals from the multifunction antenna over the global positioning system antenna splitter
• Mobile phone signals from emergency call system antenna (A2/52)

Controller Area Network (data bus/CAN bus) (CAN) 

The emergency call system control unit is a diagnostic CAN (CAN D) subscriber. The emergency call system control unit mainly receives the following signals from the electronic ignition lock control unit (N73) via this CAN:

• Crash information from the supplemental restraint system control unit (redundant), including crash level
• Operation of the emergency call system button, MB-Info button, breakdown assistance button and liftgate external operation switch
• Wheel speed signals from the Electronic Stability Program control unit (N30/4)

Transmitting signals 

• Direct lines 
• CAN 

Direct lines 

• Voice output through emergency call speaker (except CODE (810) Sound system) or the center instrument panel speaker (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 LEDs in the emergency call system button, the MB-Info button and the breakdown assistance button
• Status signals to the COMAND controller unit
• Status signals to the instrument cluster

Body 

• 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 via 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 also activated (wake-up); after four days the emergency call system goes into "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.

Wiring diagram for emergency call system control unit

PE82.95-P-2101-97NAA