Component description for emergency call system control unit - GF82.95-P-3212FLU

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MODEL 212 with CODE 359 (TELE AID emergency call system) without CODE 348 (Emergency call/assistant system)

Location

The emergency call system control unit is located in the trunk under the trunk mat on the crossmember.

Shown on model 212.0 with code (512) COMAND APS with DVD changer

Fig 1: Global Positioning System Antenna Splitter

Courtesy of MERCEDES-BENZ USA

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
Error handling
Receive signals
Transmitting signals

Realization of vehicle-related services

Realization of following vehicle-related services:

Authorization
Manual or automatic emergency call
MB-Info call
Breakdown assistance
Vehicle tracking
Vehicle remote door unlock
Vehicle remote door lock

Regulation of priorities via integrated priority management

Priority service

Automatic emergency call
Manual emergency call
Vehicle tracking
Breakdown assistance
MB-Info call
Authorization
Vehicle remote door unlocking or vehicle remote door locking

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 the Service Center and actuation of the trunk lid external operation switch (S88/8) (model 212.0) or the liftgate external operation switch (S88/8) (model 212.2), for vehicle remote door unlocking
Call to Service Center and reporting of theft for vehicle tracking

Audio management

Output of audio signals via the center instrument panel speaker (H4/27)
Audio muting

Display management

Management of displays on the Audio/COMAND display (A40/8), the instrument cluster (A1), the emergency call system button, the MB-Info button and the breakdown assistance button.

Error handling

After activation of terminal 15R, the emergency call system control unit performs a self-test (approx. 5 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

Power supply via terminal 30g and terminal 31
Terminal status signal 15R
Emergency call system button signal
MB-Info button signal
Breakdown assistance button signal
Global positioning system (GPS) signals from the multifunction antenna (A28/11), in vehicles with code (512) COMAND APS with DVD changer or with code (527) COMAND APS with single DVD drive (with navigation) via the global positioning system antenna splitter (A2/5)
Mobile telephone signals from the multifunction antenna via a coaxial cable
Mobile phone signals from emergency call system antenna (A2/52)
Signal from hands-free system microphone (A67b1) via the COMAND controller unit (A40/3)
Crash signal from supplemental restraint system control unit

CAN

The emergency call system control unit is a participant of the diagnostic CAN (CAN D) and receives data from the front SAM control unit with fuse and relay module (N10/1) (including crash information from the supplemental restraint system control unit (redundant) including crash level).

Transmitting signals

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 (MUTE) to the following control units:
Sound system amplifier control unit (N40/3) (with code (810) Sound system)
COMAND controller unit (without code (810) Sound system)
Voice output via center instrument panel speaker
Wake-up signal to COMAND controller unit
Mobile phone signals to multifunction antenna via coaxial cable
Mobile phone signals to emergency call system antenna

CAN

The emergency call system control unit is a subscriber of the diagnostic CAN and sends data to the front SAM control unit with fuse and relay module.

Body

Integrated communication module
Integrated locating module
Integrated GPS receiver for position finding (Date, time, history and last known location) for listed vehicle-related services
Memory for vehicle-specific data
Shielded 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
MB-Info call
Breakdown assistance
Vehicle remote door unlock

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 (CDMA) network. For data communication in the AMPS network, the communication module is also equipped with a modem.

AMPS and CDMA network 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 "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
Voltage supply	V	13	±1	(U_B ) takes place via terminal 15R
Voltage limits	V	9	±1	Minimum (U _Bmin )
		16	±1	Maximum (U _Bmax )
Power consumption	μA	≤360		Sleep mode (unit deactivated, "Terminal 30 OFF"); (Advanced Mobile Phone Service (AMPS) and Code Division Multiple Access (CDMA)) Typical (I_typ )
	μA	400		Sleep mode (unit deactivated, "Terminal 30 OFF"); (AMPS and CDMA) Maximum (I_max )
	mA	≤3		Stand-by mode (up to 4 days after "Terminal 15 OFF"; Network Access Device (NAD) activated); (AMPS and CDMA) Minimum (I_min )
	mA	12		Stand-by mode (up to 4 days after "Terminal 30 OFF"; NAD activated); (AMPS and CDMA) Maximum (I_max )
	mA	500		Idle mode (unit activated, without current service); (AMPS and CDMA) Typical (I_typ )
	mA	600		Idle mode (unit activated, without current service); (AMPS and CDMA) Maximum (I_max )
	mA	800		Normal mode (unit activated, with active service); (AMPS) Typical (I_typ )
	mA	1700		Normal mode (unit activated, with active service); (AMPS) Maximum (I_max )
	mA	650		Normal mode (unit activated, with active service); (CDMA) Typical (I_typ )
	mA	1200		Normal mode (unit activated, with active service); (CDMA) Maximum (I_max )
	mA	650		Send SMS Typical (I_typ )
	mA	500		Receiving SMS Typical (I_typ )
Reverse polarity protection				The emergency call system control unit is protected for a period of 5 min against polarity reversal up to a maximum of U_pol.rev. = -36 V. 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

Wiring diagram for emergency call system control unit

N123/4

PE82.95-P-2101-97DAA