Telematics services function

P82.89-2192-79

General telematics services function requirements

 Circuit 30

 Transport mode is inactive.

 The HERMES control unit is configured at the factory with the telephone number for the corresponding service provider.

 The vehicle owner is registered and authorized at the Service Center.

 Each service is authorized separately.

General telematics services

At the vehicle side, the telematics services are realized by the HERMES control unit via a cellular telephone system connection to the Service Center. The HERMES control unit transmits and receives the cellular telephone system signals via the emergency call system antenna.

For some services, the status of circuit 15 is taken into consideration. The electronic ignition lock control unit transmits the signal via the following route:

Interior CAN 

Front SAM control unit with fuse and relay module 

Diagnostic CAN 

HERMES control unit

The telematics services function encompasses the following subfunctions:

 Overview of the basic telematics services

 Overview of telematics services with code 11U (Remote Online)

 Voice connection between vehicle and Service Center

 Position finding

 Forwarding of vehicle data, displays, data queries and operating requests

 The emergency call, the Internet connection and the transfer of real-time traffic data are described elsewhere.

Overview of the basic telematics services

The following services, e.g. are available:

 Maintenance management:

If the customer has taken out a service and maintenance contract, vehicle data is transmitted via the Service Center to the service partner if necessary; the service partner then notifies the customer that service is required via the medium selected by the customer (e.g. "MyMercedes", email, telephone). If the customer has not taken out a service and maintenance contract, a pop-up window appears on the Audio/COMAND display 5 days before the calculated service date, asking whether a connection to customer center should be set up. If the customer selects "Call now", a voice connection is established to the Service Center. If the customer selects "Call later", the pop-up window is displayed again later. If the customer selects "No, thank you", no pop-up window is displayed when the service is due.

 Telediagnosis:

The condition of wear parts (e.g. brake disks) is monitored and transmitted via the Service Center to the service partner if necessary; the service partner then notifies the customer that the wear parts require replacement via the medium selected by the customer (e.g. "MyMercedes", email, telephone).

 Accident management:

The customer can request technical assistance via a voice connection after an accident.

 Breakdown management:

The customer can request technical assistance via a voice connection. With the consent of the customer, vehicle data can be transmitted in order to provide quicker and more effective assistance.

Overview of telematics services with code 11U (Remote Online)

These app services allow the customer to use his terminals (e.g. smartphone, tablet or PC) to transmit information and operating requests to the vehicle via the Service Center and receive up-to-date vehicle data that has been prepared by the app.

For example, the following app service are available:

 Remote closing and opening of the doors:

The HERMES control unit forwards the query via diagnostic CAN, front SAM control unit with fuse and relay module and interior CAN to the electronic ignition lock control unit. The electronic ignition lock control unit checks whether the locking or unlocking of all vehicle doors and the liftgate is possible, performs the locking or unlocking if possible and reports the status back to the HERMES control unit.

 Vehicle status remote query:

Vehicle data such as the status of the doors and the fuel level can be retrieved online.

 Stationary heater programming (with code 228 (Stationary heater):

The switch-on time of the stationary heater can be set online without range limitations and the status of the stationary heater can be queried online.

 Pre-entry climate control programming:

The engine is started on a parked and locked vehicle (windows and doors closed) and after a limited period it is switched off again to enable the "last mode" of the air conditioning to achieve a pre-entry climate control. The HERMES control unit forwards the trigger signal via diagnostic CAN, front SAM control unit with fuse and relay module and interior CAN to the electronic ignition lock control unit.

On vehicles with code 531 (COMAND APS), the following telematics services are additionally available, for example:

 The "concierge service" allows the user to select the permanently reserved phonebook entry "MB-Contact" to request information via a voice connection, e.g. about a local search in the area (restaurant), to obtain stock prices or to request binding services such as booking a hotel.

 The function of the telematics services is dependent on a valid subscription, depending on equipment installed in the vehicle.

Additional function requirements for voice connection between vehicle and Service Center

 No higher-priority service (e.g. automatic or manual emergency call) is active.

 For telematics services that are not safety-relevant, no smartphone is connected via the MirrorLink or CarPlay standard.

Voice connection between vehicle and Service Center

The HERMES control unit sets up a voice connection with the Mercedes-Benz Service Center via the emergency call system antenna by selecting the reserved telephone book entry "MB-Contact".

 The setup of a voice connection to the Mercedes-Benz Service Center is aborted after several unsuccessful dialing attempts, and a corresponding message appears on the Audio/COMAND display.

 Telematics services, e.g. the breakdown service, can also be triggered by the Service Center following an emergency call with the customer's consent. In this case, the voice connection that was set up for the emergency call is used again by means of transferring within the Service Center. The emergency call is then converted into a service with lower priority.

The voice connection function between the vehicle and the Service Center is split up into the following subfunctions:

 Selection of telephone book entry "MB Contact"

 Connecting

 Mute function

 Hands-free

 Termination of the voice connection

 Prioritization

Selection of telephone book entry "MB Contact"

The permanently reserved telephone book entry "MB-Contact" can be selected using one of the following components:

 Audio/COMAND control panel

 Multifunction steering wheel button groups

 Voice control system (VCS [SBS]) (with CODE 531 (COMAND APS))

The Audio/COMAND control panel control signals are forwarded via telematics CAN to the audio equipment.

The multifunction steering wheel button groups send the control signals via the following route:

Steering wheel electronics 

Steering LIN 

Steering column tube module control unit 

Chassis CAN 1 

Front SAM control unit with fuse and relay module 

Chassis CAN 2 

Instrument cluster 

Interior CAN 

Audio unit

The voice control system is activated on the left multifunction steering wheel button group. The voice control system is automatically switched off when the call is set up.

When the voice control system is active, the voice commands are picked up by the hands-free system microphone and forwarded via a direct line to the COMAND controller unit.

 The individual voice commands are listed in the "Linguatronic operator's manual".

Connecting

If the telephone book entry "MB Contact" has been selected, the audio equipment sends the request for establishing a voice connection via the following route:

Interior CAN 

Front SAM control unit with fuse and relay module 

Diagnostic CAN 

HERMES control unit

Mute function

When a voice connection is set up, the HERMES control unit sends a signal for muting the audio sources via a direct line to the following components, which actuate the speaker system:

 Sound system amplifier control unit (with CODE 810 (Sound system))

 Audio equipment (except CODE 810 (Sound system))

Hands-free

The hands-free system is not available for telephone calls for the duration of the voice connection.

After a data telegram has been transmitted to the Mercedes-Benz Service Center, the user can speak to a service receptionist via the voice connection. The Mercedes-Benz Service Center carries out the call, where possible, in the language that was selected in the system settings of the audio equipment and transmitted in the data telegram.

The HERMES control unit receives the outgoing voice signals over the audio equipment from the hands-free system microphone.

The HERMES control unit outputs the incoming voice signals over the center instrument panel speaker.

The voice output volume can be adjusted using the + and - button, setting of specific functions and the volume control of the right multifunction steering wheel button group. The right multifunction steering wheel button group sends the control signals via the following route:

Steering wheel electronics 

Steering LIN 

Steering column tube module control unit 

Chassis CAN 1 

Front SAM control unit with fuse and relay module 

Chassis CAN 2 

Instrument cluster 

Interior CAN 

Front SAM control unit with fuse and relay module 

Diagnostic CAN 

HERMES control unit

Termination of the voice connection

The Accept/terminate phone call button of the right multifunction steering wheel button group can be used to end the voice connection, if this is not done by the Mercedes-Benz Service Center. The right multifunction steering wheel button group sends the control signals via the following route:

Steering wheel electronics 

Steering LIN 

Steering column tube module control unit 

Chassis CAN 1 

Front SAM control unit with fuse and relay module 

Chassis CAN 2 

Instrument cluster 

Interior CAN 

Front SAM control unit with fuse and relay module 

Diagnostic CAN 

HERMES control unit

Prioritization

For the services that require a voice connection between the vehicle and the Service Center, the prioritization shown below is valid.

 Telematics services, e.g. accident management, can also be triggered by the Service Center after an emergency call with the customer's consent. In this case, the voice connection that was set up for the emergency call is used again by means of transferring within the Service Center. The emergency call is then converted into a service with lower priority.

Position finding

A determination of the current vehicle position is essential for many telematics services. In vehicles with code 531 (COMAND APS) or with code 522 (Audio 20 radio), the HERMES control unit takes over the position finding signals from the audio equipment. The audio equipment sends the signals via a USB line (universal serial bus) to the HERMES control unit.

In vehicles with code 505 (Radio 20 NTG5 non-navigation-capable) the position finding is conducted by the HERMES control unit. For position finding, the HERMES control unit uses the global navigation system (GPS). GPS is available worldwide. GPS position finding is irretrievable after vehicle transport (e.g. by train or ferry or after towing). Subsequent GPS position finding (following an interruption in satellite reception) can take several minutes. At the same time as the GPS position finding the HERMES control unit conducts a permanent basic position finding, that enables the position of the vehicle to be determined even when the GPS reception fails.

The position finding function consists of the following component functions:

 GPS position finding

 Basic position finding (with code 505 (Radio 20 NTG5 non-navigation-capable))

GPS position finding

The multifunction antenna forwards the received GPS signals on vehicles with code 522 (Audio 20 radio) or with code 531 (COMAND APS) to the audio equipment and on vehicles with code 505 (Radio 20 NTG5 non-navigation capable) to the HERMES control unit.

Additional function requirements for basic position finding (with code 505 (Radio 20 NTG5 non-navigation-capable))

 Circuit 15 ON

Basic position finding (with code 505 (Radio 20 NTG5 non-navigation-capable))

The HERMES control unit requires the following signals for basic position finding:

 Wheel speed and yaw rate signals from the Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS)) or from the Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS))

 Steering angle sensor

The Electronic Stability Program control unit (except code 233 (DISTRONIC PLUS)) or the Premium Electronic Stability Program control unit (with code 233 (DISTRONIC PLUS)) sends the wheel speed and yaw rate signals via the following route:

Chassis CAN 1 

Front SAM control unit with fuse and relay module 

Diagnostic CAN 

HERMES control unit

The steering angle sensor sends the signal via the following route:

Steering column tube module control unit 

Chassis CAN 1 

Front SAM control unit with fuse and relay module 

Diagnostic CAN 

HERMES control unit

The HERMES control unit uses the data to calculate the current vehicle position (longitude and latitude).

 Location errors in position finding, rolling backwards with "circuit 15 OFF" (ignition switched off) or transport of the vehicle falsify the basic position finding. In both cases, this deviation is automatically corrected on receipt of GPS data.

Forwarding of vehicle data, displays, data queries and operating requests

The HERMES control unit forwards the data, data queries and operating requests that have been received via the cellular telephone system connection to the Service Center via diagnostic CAN to the front SAM control unit with fuse and relay module, where they are further distributed in accordance with the respective requirements. The HERMES control unit receives vehicle data from the front SAM control unit with fuse and relay module via diagnostic CAN and forwards this data and the data of the integrated position finding module via the multifunction antenna to the Service Center in accordance with requirements.

The content shown on the Audio/COMAND display (e.g. pop-up windows, vehicle locating symbol, field strength) is sent by the HERMES control unit over the following path:

Diagnostic CAN 

Front SAM control unit with fuse and relay module 

Interior CAN 

Audio equipment 

LVDS line 

Audio/COMAND display

The audio equipment sends the control signals via telematics CAN to the Audio/COMAND display.

Some messages on the Audio/COMAND display can be confirmed with the Audio/COMAND control panel. The Audio/COMAND control panel sends the signals via the following route:

Telematics CAN 

Audio equipment 

Interior CAN 

Front SAM control unit with fuse and relay module 

Diagnostic CAN 

HERMES control unit