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Navigation Mode, Function - GF82.85-P-2012LFM

Model 217, 222 as of model year 2018 

G15301136Courtesy of MERCEDES-BENZ USA

Shown on model 222 

G15301137Courtesy of MERCEDES-BENZ USA

Shown: model 217 

IMPORTANTInformation on touchpad 

The touchpad is installed in two variants.

Variant 1 (with code 448 (Touchpad)): The touchpad is installed together with the Audio/COMAND control panel. The touchpad is connected only to the telematics CAN.

Variant 2 (with code 446 (Touchpad only)): The touchpad is installed instead of the Audio/COMAND control panel. In this case, the lower control panel is connected to the touchpad via the UBF-LIN. The touchpad is also connected to the telematics CAN.

Function requirements, general 

Navigation mode 

The navigation module is integrated in the head unit. The navigation system includes the following functionalities:

The location of the vehicle and the direction and distance to the destination are determined continuously with the aid of the navigation system. After entering or selecting a destination location, route calculation starts.

Depending on national version, various options can be selected for route calculation, e.g.:

If observance of the options is not possible, they are ignored for the stretches in question. Visual and acoustic signals are also output. The set options can be changed at any time. When the route is being calculated, the message "Calculating route" is output. Following calculation, the route is displayed by arrow pictograms on the Audio/COMAND display. If the vehicle is no longer traveling along the precalculated route, the route is recalculated. If the recalculated values are plausible for the navigation system, then the modified route is displayed.

IMPORTANT Dynamic route guidance (with "Dynamic route", "Dynamic route with confirmation" or "Eco route"): An alternative route is offered under dynamic route guidance, in the event of a sufficiently long traffic jam or road closure on the calculated route.

For a valid subscription, the navigation system also has apps with information (e.g. weather, gas station prices) or lists, map data of points of interest (e.g. restaurant, gas station, parking area), which can be selected as the destination or for a stopover.

IMPORTANT Destinations can be transmitted to the vehicle from the Internet via the "Mercedes-Benz Application Gateway" and imported into the navigation system.

IMPORTANT Model 217, 222

as of model year 2018

except code 498 (Japanese version)

Routes can be transmitted to the vehicle from the Internet via the "Mercedes-Benz Application Gateway" and imported into the navigation system.

IMPORTANT Model 217, 222

as of model year 2018

with code 494 (US version)

Destination entries or points of interest can be made available to the navigation module of the head unit by the Service Center.

IMPORTANT Model 222

as of model year 2018

with code ME05 (Hybrid drive 85kW/90kW VARIANT (incl. Plug-in))

The map data is used for the route-based & foresighted energy management.

The navigation system can be operated with the following components:

The touchpad transmits the operation signals over the telematics CAN to the head unit.

The "Drive Show" function can be activated in the navigation system ("Drive Show" sequence of pictures which show the current position, route, traffic information along the route, area around the destination, and the altitude course of the route covered so far).

The left rear display or the right rear display must be selected using the remote control wheel. The remote control's Kleer® radio signals are received via the following route:

Left rear display or right rear display →

HSVL →

Rear Seat Entertainment system controller unit →

MOST →

Head unit

IMPORTANT For the voice control system of navigation, in particular for destination entry, additional name lists are available in the navigation system. Name lists exist for the following information, for example, place names for selected towns/cities on the data storage medium, street names for all towns, town centers and special destinations.

The navigation mode function includes the following subfunctions:

IMPORTANT The navigation system uses a special interface to provide data that is used by other systems in the vehicle. The head unit transmits the data via the user interface CAN.

GPS position finding 

The GPS is a satellite-based position finding system, which is available on a global basis. GPS position finding is irretrievable after vehicle transport (e.g. by train or ferry or after towing). Recalculating the GPS position (after interruption of the satellite reception) can take several minutes (up to 5 minutes during initial commissioning). The accuracy of the position finding and the actual calculation are essentially based on the measurement of the run times of the signals sent synchronously by the various satellites. A vital precondition is the synchronicity of the clocks in the satellites and in the receiver. To ensure synchronicity, the receiver is equipped with an automatic time correction that is possible thanks to the satellite signals. The head unit calculates the current position of the vehicle from the GPS signals. The direction of travel is determined with the aid of the sequence of locations calculated with the GPS system.

With code 362 (HERMES LTE), as of 01.06.2019, the HERMES control unit receives GPS signals from the multifunction antenna (model 222) or from the GPS antenna (model 217) and forwards them to the head unit.

With code 362 (HERMES LTE) up to 31.05.2019 or except code 362 (HERMES LTE), the head unit receives GPS signals from the multifunction antenna (model 222) or from the GPS antenna (model 217).

IMPORTANT As GPS operates in the gigahertz (GHz) range and the signals are weak, the following events may lead to reception interference:

Atmospheric interference disturbances (e.g. bad weather, water vapor, mist), multiple reception through signal reflexions (e.g. on house walls) or signal shadowing (e.g. in built-up areas, in tunnels, due to tall buildings or trees).

Basic position finding 

If no GPS signals are received during route guidance, navigation is still possible with basic position finding. A defect, e.g. in the GPS antenna is therefore not immediately perceptible. Basic position finding runs parallel to GPS position finding.

For basic position finding the head unit requires the following information:

The head unit calculates the current vehicle position (longitude and latitude) around once per second.

IMPORTANT Location faults during position finding, rolling backwards with circuit 15 OFF or vehicle transportation falsify basic position finding. The deviation is automatically corrected by the navigation processor integrated in the head unit when GPS data is received.

IMPORTANTCalibration 

The calibration following a tire replacement is performed automatically. Because of the tire abrasion, a constant recalibration of the tire circumference is required. Recalibration is carried out automatically and uses the difference between the calculated and actually traveled distance between two turning points that has been determined using map-based position finding.

Route calculation 

Route calculation is accomplished using the options set to the best possible extent. If observance of the options is not possible, they are ignored for the stretches in question. Visual and acoustic signals are also output. The set options can be changed at any time. When the route is being calculated, the message "Calculating route" is output. Following calculation, the route is displayed by arrow pictograms on the Audio/COMAND display. If the vehicle is no longer traveling along the precalculated route, the route is recalculated. If the recalculated values are plausible for the navigation system, then the modified route is displayed.

Destination-oriented navigation 

he integrated navigation processor continuously compares the route calculation data with the position finding data and uses the data to deduce measures for further route guidance. The route guidance is carried out by outputting visual and acoustic information and is divided up into the following areas:

Map route guidance 

Route guidance via a map is shown on the Audio/COMAND display or the instrument cluster.

The head unit transmits a switch-on request to the Audio/COMAND display via the telematics CAN. At the same time, the head unit generates the signals for visually depicting route guidance (map navigation), and transmits these to the Audio/COMAND display via the HSVL line. For visualization in the instrument cluster, the head unit transmits corresponding video signals for high-resolution visualization via the HSVL line to the instrument cluster.

Route guidance through driving lane recommendations 

For certain turnoff situations on multiple-lane exit points (e.g. freeway intersections), driving lane recommendations are shown in the bottom line. When a turnoff recommendation is given, the distance to the turnoff point is also displayed using a bar graph. The lanes have arrows assigned to them, which indicate on which lane the destination can be reached or the best way to reach it.

With day design, the following colors are used on the Audio/COMAND display:

White: best or recommended lane

Light gray: the lane is correct, but a lane change will soon be required.

Dark gray: this lane will not take you to the destination.

Route guidance by means of voice output 

Route guidance by means of voice output is an assistance function that assists the driver without distracting him from the traffic. Voice is output with the selected system language. The route guidance of the navigation system is supported by voice outputs with the following information:

Further voice messages take place, e.g. at the start of route calculation, when an intermediate destination has been reached, or when the destination has been reached.

During dynamic route guidance, additional voice messages are issued due to traffic messages affecting the route. In some cases, special information is also issued via voice output in certain circumstances, e.g.:

The navigation processor of the head unit links word segments to form complete instructions or information during voice output.

During active voice output, the volume of the voice outputs can be regulated using the volume adjustment button of the Audio/COMAND control panel (with code 448 (Touchpad)), of the lower control panel (with code 446 (Touchpad only)), the volume adjustment switch of the head unit multifunction steering wheel button group or using the remote control (with code 864 (Rear Seat Entertainment System)).

The Audio/COMAND control panel (with code 448 (Touchpad)) transmits the status of the volume adjustment button to the head unit via the telematics CAN.

The lower control panel (with code 446 (Touchpad only)) transmits the status of the volume adjustment button via the following route:

LCP LIN

Touchpad (with code 446 (Touchpad only)) →

Telematics CAN →

Head unit →

The status of the head unit multifunction steering wheel button group's volume adjustment switch is forwarded via the following route:

Steering wheel electronics →

Steering wheel CAN →

Steering column tube module control unit →

Suspension FlexRay →

Electronic ignition lock control unit →

User interface CAN →

Instrument cluster →

User interface CAN →

Head unit

The remote control sends the status of the volume adjustment button via the following route:

Left rear display or right rear display (with code 864 (Rear Seat Entertainment System)) →

HSVL →

Rear entertainment controller unit

On vehicles except CODE 810 (Sound system) and except CODE 811 (Advanced sound system), the voice output is forwarded to the speaker system by the head unit.

In vehicles with CODE 810 (Sound system), the head unit transmits the voice output via the MOST to the sound system amplifier control unit. The sound system amplifier control unit amplifies the signals and forwards them to the speaker system.

In vehicles with code 811 (Advanced sound system), the head unit sends the voice output over MOST to the Advanced sound system amplifier control unit. The Advanced sound system amplifier control unit amplifies the signals and forwards them to the speaker system.

Dynamic route guidance (except code 498 (Japan version) and except code 367 (Live Traffic Information)) 

Dynamic route guidance is performed in "Dynamic route", "Dynamic route with confirmation" or "Eco route" mode (except code 498 (Japan version)). During dynamic route guidance the current traffic situation is taken into consideration when appropriate traffic data is received. The traffic data recorder decodes the traffic information and forwards it internally to the navigation processor upon request. The navigation processor makes the decision whether the route should be changed. During dynamic routing with confirmation, the user is notified of the effects of the route change on the travel distance and driving time. The route is only changed with the user's agreement.

If necessary, a message that the route should be changed is output via the speaker system.

The incoming information about the traffic situation can be received by the Radio Data System/Traffic Message Channel (RDS/TMC) function via FM radio or digital radio (DAB) (with code 537 (Digital radio (DAB))) if an appropriate station has been selected.

IMPORTANT Dynamic route guidance via RDS/TMC occurs if no real-time traffic data is received via the HERMES control unit (e.g. no valid subscription or the vehicle is not within the geographical area for which the traffic data service is offered).

The head unit's FM receiver receives the traffic messages via the following route, and forwards them internally to the traffic data recorder:

Rear window antenna (model 217.3 and model 222) or windshield antenna (model 217.4) →

FM, AM, CL, DAB antenna amplifier and KEYLESS-GO or FM2, DAB and TV2 antenna amplifier →

Head unit

In vehicles with code 537 (Digital radio (DAB)), the DAB band III signals are forwarded via the following route:

Rear window antenna (model 217.3 and model 222) or windshield antenna (model 217.4) →

FM2, DAB and TV2 antenna amplifier or FM, AM, CL, DAB antenna amplifier and KEYLESS-GO →

Head unit

Vehicle Information and Communication System (VICS) over the FM multiplexer (with code 498 (Japan version)) 

The driver is provided with vital information by the VICS on the current traffic situation. Traffic impairments and traffic jams are shown on the map, however they are not incorporated into the dynamic route guidance. The VICS messages are transmitted as FM radio signals, and are received as follows:

Rear window antenna (model 217.3 and model 222) or windshield antenna (model 217.4)

FM, AM, CL, DAB antenna amplifier and KEYLESS-GO or FM2, DAB and TV2 antenna amplifier →

Head unit

The VICS information is processed in the FM multiplexer integrated in the head unit. The head unit then transmits the data required for displaying the information to the Audio/COMAND display via the HSVL line.

Dynamic route guidance with VICS (with code 498 (Japan version), Dealer Option) 

The Vehicle Information and Communication System (VICS) control unit and the Dedicated Short-Range Communications control unit are required for dynamic route guidance. The Vehicle Information and Communication System (VICS) control unit contains both the receiver and the antenna. The antenna communicates with the VICS beacons (transmitter masts) installed at the roadside which transmit microwave signals within a 2.5 gigahertz reception range or infrared signals. The received signals are transmitted to the head unit via the Dedicated Short-Range Communications control unit and decoded. The Dedicated Short-Range Communications control unit receives VICS signals in the 5.8 gigahertz reception range via the DSRC antenna and forwards them to the head unit. The traffic messages are stored in the traffic data recorder of the head unit, decrypted and forwarded to the navigation processor on request. The navigation processor makes the decision whether the route should be changed. If necessary, a message saying that the route was changed is issued.

Additional function requirements for dynamic route guidance with real-time traffic data via the HERMES control unit (with code 367 (Live Traffic Information)) 

IMPORTANT At the end of the subscription or outside of the geographical area for which the traffic data service is offered, only the dynamic route guidance with radio traffic messages is available.

Dynamic route guidance with real-time traffic data via the HERMES control unit (with code 367 (Live Traffic Information)) 

The HERMES control unit receives real-time traffic data from the service provider via the following antennas:

IMPORTANT The antennas form a sending/reception diversity.

The real-time traffic data not only include information gathered via satellite support. Via the car-to-X communication function, information on potential hazards in road traffic are also received, either via the recognition potential of the vehicle sensor system of other Mercedes-Benz vehicles or manually by the vehicle occupants within a radius of 10 km.

The HERMES control unit forwards real-time traffic data to the head unit. The HERMES control unit receives position data from the head unit at regular intervals. Data exchange between the HERMES control unit and the head unit takes place via a wireless connection between the HERMES control unit's integrated WLAN interface (Wireless Local Area Network) and the WLAN antenna.

The HERMES control unit transmits the position data to the service provider via the specified antenna connection. In this way, the HERMES control unit contributes to collecting the traffic information, from which the dynamic route guidance then benefits in turn.

Map function 

The map display is always controlled by the head unit. The following display functions are supported:

IMPORTANT In vehicles with a valid subscription, software updates can be downloaded online in the vehicle. If software updates are stored on mass media storage devices, they can be transferred to the head unit via the multimedia connection unit.

Extended navigation functions 

The navigation system is extended with regard to convenience, customization and tourist information by the following functions:

Data communication between the head unit and the SD card takes place via the USB connection between the head unit and the multimedia connection unit.

The extended navigation mode functions are implemented internally in the head unit and, where applicable, shown via the HSVL line on the Audio/COMAND display.

  Electrical function diagram for navigation mode (COMAND) function Model 217 as of model year 2018 PE82.85-P-2063-97SEN
    Model 222 as of model year 2018 PE82.85-P-2063-97SEM
  Overview of system components, telematics   GF82.85-P-9999LFM
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