LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2017 >> C300 Base, 2D Convertible >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Electrical System - Body - 205 Chassis - 2 Of 5 >> Basic Knowledge >> Navigation Mode, Function >> Navigation Mode, Function - GF82.85-P-2012RFM

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

Model 205 

as of model year 2019 

with code 531 (COMAND APS) 

Model 253.99 

with code 531 (COMAND APS) 

G13025025Courtesy of MERCEDES-BENZ USA

IMPORTANT

Model 205 as of model year 2019

with code 446 (Touchpad only)

with code 531 (COMAND APS)

Model 205

as of model year 2019

with code 448 (Touchpad)

with code 531 (COMAND APS)

Model 253.99

with code 446 (Touchpad only)

with code 531 (COMAND APS)

Information on touchpad 

The touchpad is installed in two variants.

Variant (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 upper control panel control unit, the left lower control panel and right lower control panel are connected to the touchpad via UBF-LIN. The touchpad is also connected to the telematics CAN.

Function requirements, general 

Navigation mode 

The navigation module is integrated into 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.

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

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

IMPORTANT

Model 205 as of model year 2019

with code 531 (COMAND APS)

except code 498 (Japanese version)

Model 253.99

with code 531 (COMAND APS)

except code 498 (Japanese version)

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

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

The navigation system can be operated with the following components:

IMPORTANT For the navigation VCS, in particular for destination input, 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:

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 GPS receiver in the head unit receives the GPS signals from one of the following components:

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.

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 reflections (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 signal is 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 backward 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 

The 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.

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.

Route guidance through driving lane recommendations 

For certain turnoff situations on multiple-lane exits (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: the 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.

IMPORTANT The instrument cluster only displays white arrows. The head unit transmits these via the HSVL line to the instrument cluster.

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.

IMPORTANT The announcement volume can be adjusted when voice output is active.

In vehicles except code 810 (Sound system) or except code 853 ("Midline" 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 853 ("Midline" sound system), the head unit transmits the voice output to the Midline sound system amplifier control unit via MOST. The Midline sound system amplifier control unit amplifies the signals and forwards them to the speaker system.

The volume of the voice outputs can be adjusted during a voice output using the volume adjustment button (manual transmission) on the left lower control panel, using the volume control button (automatic transmission) on the right lower control panel or using the volume adjustment switch on the head unit multifunction steering wheel button group.

The left lower control panel transmits the status of the volume control button (manual transmission) or the right lower control panel transmits the status of the volume adjustment button (automatic transmission) via the LCP LIN, the Audio/COMAND control panel (except code 446 (Touchpad only)) or the touchpad (with code 446 (Touchpad only)) and the telematics CAN to the head unit.

The steering wheel electronics reads in the control signals of the head unit multifunction steering wheel button group directly. The steering column tube module control unit reads them in over the steering-wheel CAN and sends them to the head unit over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN.

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).

In model 205.0/1/3, the head unit receives the traffic information via the rear window antenna, the FM 1, AM, CL and KEYLESS-GO antenna amplifier or the FM 2 and DAB band III antenna amplifier.

In model 205.4, the head unit receives the traffic information via the windshield antenna and the FM 1, AM, CL and KEYLESS-GO antenna amplifier.

In model 205.2, 253.99, the head unit receives the traffic information via the rear spoiler antenna and the FM 1, AM, CL and KEYLESS-GO antenna amplifier.

The FM receiver in the head unit forwards the traffic messages to the traffic data recorder in the head unit.

In model 205.0/1/3 with code 537 (Digital radio (DAB)), the head unit receives the DAB band III signals via the rear window antenna, the FM 1, AM, CL and KEYLESS-GO antenna amplifier or the FM 2 and DAB band III antenna amplifier.

In model 205.4 with code 537 (Digital radio (DAB)), the head unit receives the DAB band III signals via the windshield antenna and the FM 1, AM, CL and KEYLESS-GO antenna amplifier.

In model 205.2, 253.99 with code 537 (Digital radio (DAB)), the head unit receives the DAB band III signals via the rear window antenna and the FM 2, DAB and TV 1 antenna amplifier.

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.

The head unit receives the FM-1 signals via the rear window antenna (model 205.0/1/3), windshield antenna (model 205.4) or the rear spoiler antenna (model 205.2, 253.99) and FM 1, AM, CL and KEYLESS-GO antenna amplifier.

The head unit receives the FM-2 signals via the rear window antenna (model 205.0/1/3), windshield antenna (model 205.4) or the rear spoiler antenna (model 205.2, 253.99) and FM 2 and DAB band III antenna amplifier (model 205.0/1/3) or FM 1, AM, CL and KEYLESS-GO antenna amplifier (model 205.2/4, 253.99).

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)) 

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 by the roadside, which transmit microwave signals within a reception range of 2.5 gigahertz 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 reception range of 5.8 gigahertz 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 of 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 emergency call system antenna. 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 the 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 using a wireless connection between the integrated WLAN interface of the HERMES control unit and the WLAN antenna.

The HERMES control unit transmits the position data from the head unit to the service provider via emergency call system antenna. 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 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 converted internally in the head unit and - where applicable - shown over the HSVL line on the Audio/COMAND display.

  Electrical function diagram for navigation mode (COMAND) function   PE82.85-P-2063-97FBB
  Overview of system components, telematics   GF82.85-P-9999RF 
scientia non olet · About LEMON Manuals