Part 2

GF82.95-P-0004FQU Emergency Call System, Function
MODEL 218
- with CODE (359) TELEAID emergency call system

"Tracking" function requirements
^ Vehicle reported as stolen to police by vehicle owner and then to service center as well as legitimization of the vehicle owner
^ No fault in GPS antenna systems and signals from at least 3 GPS satellites
^ A higher-priority vehicle-related service is not active

"Tracking" function sequence
After the vehicle has been reported as stolen to the service center and legitimization of the vehicle owner, an initiation command is sent to the vehicle which prompts the emergency call system control unit to transmit the current GPS coordinates to the service center. The initiation command is received by the communication module integrated into the emergency call system control module over the following path:
- Multifunction antenna
- Direct line
The emergency call system control unit then activates the GPS position finding. Then the communication module integrated into the emergency call system control unit sends the position data to the service provider in the same manner as the "EDW [ATA] alarm" message.
The position data is transmitted cyclically and for the following events:
- Exceeding a certain distance
- Recognition of damage to or manipulation of the vehicle
- Switching the ignition on or off
The service center forwards the location of the vehicle to the responsible command staff of the police or the security services. If necessary, a telephone connection is established between the service center and the vehicle. The telephone connection is also visualized in the Audio/COMAND display.
Vehicle tracking can only be deactivated by the service center.

Function sequence for manual or automatic emergency call
The emergency call function consists of the following subfunctions:
^ Function sequence for triggering a manual emergency call
^ Function sequence for triggering an automatic emergency call
^ Function sequence for transmission of the emergency call data and communication with the service center

Function sequence for triggering a manual emergency call
The emergency call system button is pressed for t > 0.5 s.
The emergency call system control unit directly reads in the status of the emergency call system button via a direct line. Then, a voice connection to the service center is established.

Function sequence for triggering an automatic emergency call
The emergency call system control unit reads in the crash signal from the supplemental restraint system control unit via a direct line.
At the same time, the emergency call system control unit receives the crash signal (redundant) and the crash level from the supplemental restraint system control unit via the following route:
- Chassis CAN
- Front SAM control unit
- Diagnostic CAN

Function sequence for transmission of the emergency call data and communication with the service center
After a manual or automatic emergency call has been initiated, the emergency call system control unit completes a voice connection to the service center.
The feedback of the service center is provided by means of an acoustic signal. The emergency call system control unit then automatically transmits a short message (Short Message Service (SMS)) with the following data to the service center via the integrated communication module:
- Vehicle position, direction of travel and history
- Vehicle data and crash analysis (accident severity)
The communication module integrated into the emergency call system control unit transmits and receives the mobile phone signals via the following route:
- Direct line
- Multifunction antenna
If no connection to the service center is established when an automatic emergency call is triggered, the vehicle occupants also have the option of establishing a telephone connection by manually dialing the emergency number "911" and communicating the listed data verbally.
If a manual or automatic emergency call is active, this is indicated by one of the two red LEDs integrated into the emergency call system button flashing. This is also indicated in the multifunction display and on the COMAND display.

Additional function requirements for breakdown assistance
^ Breakdown assistance triggered by pressing the breakdown assistance button (actuation time t > 0.5 s)
^ A higher-priority vehicle-related service is not active

Breakdown assistance function sequence
By pressing the breakdown assistance button, a telephone connection to the service receptionist of the CAC is established. The customer now has the option of clarifying the details of the technical problem with the service receptionist, who then initiates appropriate effective remedial the breakdown assistance is active. measures. At the same time, the emergency call system control unit transmits vehicle-specific identifying data to the CAC.
The LED of the breakdown assistance button flashes as long as the breakdown assistance is active.
The breakdown assistance function consists of the two following subfunctions:
^ Breakdown assistance function sequence
^ Function sequence for display of additional services

Breakdown assistance function sequence
The status of the breakdown assistance button is read in by the emergency call system control unit over a direct line. The emergency call system control unit automatically transmits an SMS with the following data to the CAC via the communication module integrated into the emergency call system control unit:
- Vehicle position
- Customer identification data
- Vehicle identification data
- Condition data

Function sequence for display of additional services
Additionally, the following other services are offered, which are shown on the COMAND display:
- "Destination Feed In" (destination coordinates, which can be taken over from the navigation system)
- "Freetext" (transmission of text messages)
The additional services, e.g. "Freetext", are shown by the emergency call system control unit in the COMAND display via the following route:
- Diagnostic CAN
- Front SAM control unit
- Interior CAN
- COMAND control unit
- Low voltage differential signal (LVDS) line

Additional function requirements for MB-Info
^ Triggering an MB-Info call by pressing the MB-Info button (actuation time t > 0.5 s)
^ A higher-priority vehicle-related service is not active

MB-Info function sequence
This vehicle-related service is a voice service that is provided via the communication module integrated into the emergency call system control unit.
The MB-Info function consists of the two following subfunctions:
^ MB-Info call function sequence
^ Function sequence for display of additional MB-Info services

MB-Info call function sequence
The MB-Info button is read in by the emergency call system control unit via a direct line. The emergency call system control unit then automatically transmits an SMS to the CAC with the following data:
- Vehicle position
- Customer identification data
- Vehicle identification data
A voice connection to the CAC is also established via the emergency call system control unit.
An activated MB-Info call is signaled optically by the flashing of the LED in the MB-Info button.
The emergency call system control unit sends and receives the mobile phone signals via the following route:
- Direct line
- Multifunction antenna
During an MB-Info call, other vehicle-related services and active mobile phone connections are interrupted.

Function sequence for display of additional MB-Info services
Additionally, the following other services are offered, which are shown on the COMAND display:
- "Destination Feed In" (destination coordinates, which can be taken over from the navigation system)
- "Freetext" (transmission of text messages)
The additional MB-Info services, e.g. "Freetext", are shown by the emergency call system control unit in the COMAND display via the following route:
- Diagnostic CAN
- Front SAM control unit
- Interior CAN
- COMAND control unit
- Low voltage differential signal (LVDS) line

Additional function requirements for remote door unlocking
^ The vehicle-related service remote door unlocking is activated in electronic ignition lock control unit
^ Query by vehicle owner via telephone to the service center and for remote door unlocking as well as legitimization of vehicle owner by the service center

Vehicle remote door unlock function sequence
The remote door unlocking subfunction is activated by pressing the trunk lid external operation switch (S88/8) for t > 15 s after the service center was commissioned with the remote door unlocking.
The emergency call system control unit reads in the status of the trunk lid external operation switch via the following route:
- Direct line
- Rear SAM control unit with fuse and relay module
- Interior CAN
- Front SAM control unit with fuse and relay module
- Diagnostic CAN
The emergency call system control unit then automatically transmits an SMS with the following data to the Service Center, via the communication module integrated into emergency call system control unit:
- Vehicle identification number (VIN)
- Vehicle model
The communication module integrated into the emergency call system control unit transmits the mobile phone signals via the following route:
- Direct line
- Multifunction antenna
The Service Center compares the data sent with the request and driver legitimization and, if the data matches, a "vehicle remote door unlock request" is sent to the vehicle.
The communication module integrated into the emergency call system control unit receives the "Vehicle remote door unlock request" and the mobile phone signals over the following path:
- Multifunction antenna
- Direct line
After receiving the "vehicle remote door unlock request", the emergency call system control unit sends the request to the electronic ignition lock control unit via the following route:
- Diagnostic CAN
- Front SAM control unit with fuse and relay module
- Interior CAN
The electronic ignition lock control unit then initiates the unlocking of all vehicle doors and the unlocking of the trunk lid. The execution of the remote door unlocking is shown by a message in the multifunction display. In addition, the red light-emitting diode in the emergency call system button flashes.
If the "Vehicle remote door unlock request" is refused by the service center because, for example, the external operation switch was not actuated at the time agreed on or legitimization was incorrect, the vehicle remote door unlock function is disabled for t = 15 min.

Additional function requirements for remote door locking
^ Query by vehicle owner via telephone to the service center and for remote door locking as well as legitimization of vehicle owner by the service center
^ A higher-priority vehicle-related service is not active

Vehicle remote locking function sequence
With the vehicle remote door locking partial function, the vehicle owner has the opportunity to have his/her unlocked vehicle locked.
The service center checks the request and the legitimization of the vehicle owner and, if the data matches, it sends a remote door locking request to the vehicle.
The remote door locking request is received by the emergency call system control unit in the following way:
- Multifunction antenna
- Direct line
After receiving the remote door locking request, the emergency call system control unit sends the request to the electronic ignition lock control unit via the following route:
- Diagnostic CAN
- Front SAM control unit
- Interior CAN
The electronic ignition lock control unit then checks whether the locking of all vehicle doors and trunk lid is possible. If yes, the electronic ignition lock control unit initiates locking of all vehicle doors and the trunk lid. If not, feedback is sent to the service center via the same route as the remote door locking request.
If the vehicle doors and the trunk lid have been locked, feedback is also sent to the service center via the same route as the remote door locking request. After receiving the feedback, the service center notifies the vehicle owner of the remote door locking result (locked: yes or no) via the phone connection that is still active.