LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2016 >> CLS400 4Matic >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Electrical System - Body - 218 Chassis - 2 Of 5 >> Basic Knowledge >> Navigation mode, function >> Navigation mode, function - GF82.85-P-2012FQM

Navigation mode, function - GF82.85-P-2012FQM

MODEL 218 as of model year 2015 with CODE 531 (COMAND APS) 

Fig 1: Navigation Mode Block Diagram - Shown On Model 218
G10083333Courtesy of MERCEDES-BENZ USA

Shown on model 218 as of 1.9.14 

Function requirements for navigation mode in general 

General navigation mode 

The navigation module is integrated in the COMAND controller unit.

The navigation system includes the following functionalities:

The location and direction of movement of the vehicle are continuously determined with the aid of the navigation system. After entering or selecting a destination location, route calculation starts. Various options can be selected for calculating the route, depending on the model year and the national version, such as:

If observance of the options is not possible, then the options set are ignored for the sections in question and a message is displayed and signaled audibly. The set options can be displayed and changed at any time.

An acoustic notification is issued ("The route is being calculated"). After the calculation has been made, the route is displayed using arrow pictograms on the Audio/COMAND display. If the vehicle deviates from the route, the new route is re-calculated. If the recalculated values are plausible for the navigation system, then the modified route is displayed.

IMPORTANT Dynamic route guidance (with "Dynamic route" or "Eco route"): Dynamic route guidance provides an alternative route if the calculated route has a sufficiently long traffic jam or a road closure on it.

The navigation system is equipped with lists and map data on points of interest (e.g. restaurant, gas station, parking spot), that can be selected as a destination or a stopover.

IMPORTANT MODEL 218 as of model year 2015 with CODE 531 (COMAND APS) without CODE 498 (Japanese version)

Routes (except CODE 498 (Japan version)) or destinations can be transmitted from the Internet via the Mercedes-Benz Application Gateway to the vehicle and transferred into the navigation system. Compare also information "Internet connection, function".

IMPORTANT MODEL 218 as of model year 2015 with CODE 348 (Emergency call/assistant system) with CODE 531 (COMAND APS)

In vehicles with CODE 348 (Emergency call/assist system), destination entries or POIs can also be provided to the COMAND controller unit navigation module from the service center. Transfer of this map data is described in the information entitled, "Additional telematics services, function" (with CODE 348 (Emergency call/assist system)).

The navigation system can be operated with the following components:

The COMAND controller unit receives the control signals from the left multifunction steering wheel button group and from the right multifunction steering wheel button group via the following route:

When entered using the Audio/COMAND control panel, the control signals are sent via the telematics CAN to the COMAND controller unit.

When entries are made via the control panels on the COMAND controller unit, the control signals are processed within the unit.

When operating with the voice control system, voice input takes place via the hands-free system microphone. Words spoken into the hands-free system microphone are converted into an electrical signal and transferred via a direct line to the COMAND controller unit.

IMPORTANT For the voice control system of the navigation, in particular for destination entry, additional name lists are available in the system. There are additional name lists, e.g. for the following information: Place names for selected towns/cities on the data medium, street names for all towns, town centers.

The navigation function consists of the following subfunctions:

General Global Positioning System (GPS) position finding 

The GPS is a satellite-based positioning system. It is available worldwide. GPS position finding is irretrievable after vehicle transport (e.g. by train or ferry or after towing). Recalculating the GPS position (after satellite reception has been interrupted) can take several minutes (up to 5 minutes during initial commissioning). The accuracy of the position finding and the actual calculation is essentially based on the measurement of the runtimes of the signals transmitted 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.

Additional function requirements for GPS position finding 

GPS position finding function sequence 

The GPS signals are received directly by the GPS receiver integrated into the COMAND controller unit from the multifunction antenna or, in vehicles with CODE 348 (Emergency call/assist system) or CODE 359 (TELEAID emergency call system), by the multifunction antenna via the global positioning system antenna splitter. The GPS signals are used by the COMAND controller unit to calculate the current vehicle position (receiver). The vehicle's direction of travel is also determined using the sequence of GPS calculated locations.

IMPORTANT Since GPS operates in the gigahertz range (microwaves) and the signals are weak, the following events may lead to reception interference: Atmospheric interferences (e.g. bad weather, water vapor, fog), multi-path reception due to reflections of the signals (e.g. at building walls) or signal shadowing (e.g. in built-up areas, in tunnels, due to tall buildings or trees).

General information on basic position finding 

Navigation can be continued without a GPS signal using basic position finding. A possible defect, (e.g. in the multifunction antenna) is not immediately noticeable. Basic position finding runs parallel to GPS position finding. For basic position finding the COMAND controller unit requires the following information:

Basic position finding function sequence 

For basic position finding, the COMAND controller unit requires signals from the following components:

The gyro sensor and 3-D acceleration sensor data is forwarded within the COMAND controller unit.

The COMAND controller unit receives the wheel speed signals from the Electronic Stability Program control unit (except CODE 233 (DISTRONIC PLUS), except model 218.374) or the Premium Electronic Stability Program control unit (with CODE 233 (DISTRONIC PLUS) or model 218.374) via the following route:

The current vehicle position is calculated from the signals that are received (longitude and latitude). The basic position finding calculation is performed approx. once per second.

IMPORTANT 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 instances the deviation is automatically corrected by the COMAND controller unit's integrated navigation processor upon reception of GPS data.

Calibration 

The calibration following a tire replacement is performed automatically.

Recalibration 

Because of the tire abrasion, a constant recalibration of the tire circumference is required.

This recalibration is carried out automatically and uses the difference between the calculated and actually traveled distance between turning points calculated with the aid of map-based position finding.

General information on route calculation 

Route calculation is accomplished using the options set to the best possible extent. If observance of the options is not possible, then the options set are ignored for the sections in question and a message is displayed and signaled audibly. The set criteria and options can be displayed and changed at any time. After a successful calculation, the route is displayed on the map and this information is then relayed acoustically - "Route is being calculated".

Destination-oriented navigation function sequence 

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

Map route guidance 

Signals for visual depiction of the route guidance (map navigation) are generated by the COMAND controller unit and sent to the audio/COMAND display via an LVDS line. The Audio/COMAND display is switched on over the telematics CAN by the COMAND controller unit.

Destination-oriented navigation through driving lane recommendations 

For certain turnoff situations on multiple-land exit points (e.g. freeway intersection) driving lane recommendations are shown in the bottom line. In addition, when a turnoff recommendation is given, the distance to the actual turnoff point is also displayed by means of 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 valid for representation in the Audio/COMAND display:

IMPORTANT The instrument cluster only displays the white arrows.

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 destination-oriented navigation of the navigation system is supported by voice outputs with the following information:

Further voice messages occur, at the start of route calculation, for example, 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. Special information is issued in some instances by voice output, for example:

The COMAND controller unit's navigation processor links word segments during a voice output to form complete instructions or information.

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

In vehicles without CODE 810 (Sound system) or CODE 811 (Advanced sound system), the voice output is forwarded to the speaker system by the COMAND controller unit.

In vehicles with CODE 810 (Sound system) or CODE 811 (Advanced sound system), the COMAND controller unit sends the voice output via MOST to the sound system amplifier control unit. The sound system amplifier control unit amplifies the signals and forwards them to the speaker system.

IMPORTANT More detailed information on the speaker system is available in the "Speaker output function" information.

General information on dynamic route guidance 

With dynamic route guidance ("Dynamic route" or "Eco route") the current traffic situation is taken into account 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. If necessary, a message that the route should be changed is output via the speaker system.

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.

Function sequence for dynamic route guidance (except CODE 494 (USA version), except CODE 498 (Japan version) and except CODE B54 (Live Traffic Information) and subscription for real-time traffic data) 

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)) if an appropriate station has been selected.

The rear window antenna receives the FM radio signals and forwards the traffic messages via the following antenna amplifiers to the COMAND controller unit:

In vehicles with CODE 537 (Digital radio), the traffic messages that are received via DAB 1 band III are forwarded to the COMAND controller unit via the following route:

In vehicles with CODE 537 (Digital radio), the traffic messages received via DAB 2 band III are forwarded to the COMAND controller unit via the following route:

Function sequence for Vehicle Information and Communication System (VICS) via 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 radio antenna signal travels to the COMAND controller unit as follows:

The VICS information is processed in the FM multiplexer integrated into the COMAND controller unit. The prepared VICS information is displayed on the Audio/COMAND display via the LVDS line.

Function sequence for VICS dynamic route guidance (with CODE 498 (Japan version), dealer option) 

The VICS control unit and the Dedicated Short-Range Communications control unit are used for dynamic route guidance.

The 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. Received signals are transmitted directly to the COMAND controller unit where they are decoded.

The Dedicated Short-Range Communications control unit receives VICS signals in the 5.8 gigahertz reception range via the ETC/DSRC antenna and forwards them to the COMAND controller unit.

The traffic messages are stored and relayed to the navigation processor. The traffic data recorder decodes the traffic information and forwards this to the navigation processor upon request.

Function sequence for dynamic route guidance with Real Time Traffic Data (RTTD) (with CODE 494 (USA version) and CODE 536 (SIRIUS satellite radio)) 

RTTD consists of real-time traffic data that is transmitted via the "Sirius" satellite radio provider, and the reception and processing of the data is made possible by the tuner unit. The real time traffic data contain accident and traffic jam messages as well as traffic flow information. The real-time traffic data is available around the major cities in the USA, and is transmitted every 5 minutes. The tuner unit receives the real-time traffic data over a direct line from the multifunction antenna and sends it over MOST to the COMAND controller system's navigation system. The COMAND controller unit uses the data to calculate alternative routes and displays them on the Audio/COMAND display over the LVDS line.

Additional function requirements for dynamic route guidance with real-time traffic data via the telematics services communications module (with CODE B54 (Live Traffic Information)) 

IMPORTANT Once the subscription has expired, in vehicles with CODE B54 (Live Traffic Information), only the dynamic route guidance with TMC messages via RDS is available.

Function sequence for dynamic route guidance with real-time traffic data via the telematics services communications module (with CODE B54 (Live Traffic Information)) 

The telematics services communications module receives the real-time traffic data via the emergency call system antenna from the service provider and sends the data over a direct line (universal serial bus (USB)) to the COMAND controller unit.

The COMAND controller unit sends position data cyclically via a direct line (USB) to the telematics services communications module. The telematics services communications module sends the positioning data over the emergency call system antenna to the service provider. The telematics services communications module then contributes to collating the traffic information from which the dynamic route guidance then benefits again.

Map function 

Map display is always controlled by the COMAND controller unit. The following display functions are supported:

Expanded functions of the navigation mode 

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

The extended functions of the navigation mode are converted internally in the COMAND controller unit and, where applicable, shown over the LVDS line on the Audio/COMAND display.

Electrical function diagram for navigation mode (COMAND), function   PE82.85-P-2063-97XAM
Overview of system components, telematics MODEL 218
as of model year 2015
with CODE 531 (COMAND APS)		 GF82.85-P-9999FQA 
scientia non olet · About LEMON Manuals