Navigation, Function - GF82.61-P-2003RFM
Model 205
as of model year 2019
with code 357 (Map Navigation)
Model 205 as of model year 2019 with code 357 (Map Navigation) with code 446 (Touchpad only)
Model 205 as of model year 2019 with code 357 (Map Navigation) with code 448 (Touchpad)
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
- Circuit 30t ON
- Transport mode not active
- Authorized Secure Digital (SD) card in the SD card slot on the multimedia connection unit
- Signals from at least 4 GPS satellites (global navigation system) present
- Head unit ON
The SD card must be authorized for the head unit.
Map Navigation, general
The head unit processes the following input information:
- Map data from the SD card via the multimedia connection unit
- Wheel speed signals via the electronic ignition lock control unit, from the Electronic Stability Program control unit
- Reverse gear signal from electronic ignition lock control unit
- As of 01.06.2019 with code 362 (HERMES LTE): GPS signals from the HERMES control unit
- Up to 31.05.2019 and except for code 362 (HERMES LTE): GPS signals directly from the GPS antenna or via the global positioning system antenna splitter (with code 355 (preinstallation for navigation retrofitting) and code 362 (HERMES LTE) and code 830 (China-vehicles additional parts) or with code 362 (HERMES LTE) and code 506 (Radio Audio 20 NTG 5.5) and code 830 (China-vehicles additional parts))
- Activation of the menu via the upper control panel control unit
- Operation via the Audio/COMAND® control panel (except code 446 (Touchpad only)) or via the touchpad (with code 448 (Touchpad) or code 446 (Touchpad only))
- Operation via the head unit multifunction steering wheel button group
- Operation of the Voice Control System (VCS) via the driver handsfree system microphone
- Volume control for the audio output via the volume adjustment button (manual transmission) on the left lower control panel, via the volume control button (automatic transmission) on the right lower control panel or via the volume adjustment switch in the head unit multifunction steering wheel button group
- Traffic Message Channel (TMC) or comparable radio traffic messages from the FM radio tuners integrated in the head unit (except code 367 (Live Traffic Information) with valid subscription for real-time traffic data)
- Real-time traffic data from the HERMES control unit (with code 367 (Live Traffic Information) and a valid subscription for real-time traffic data)
- Updates of map data and navigation software via SD card on Internet-capable PC
The acoustic driving information is output by the head unit via the front speaker system. If necessary, the head unit reduces the volume of any active audio sources.
In vehicles with code 810 (Sound system) or code 853 ("Midline" sound system), the head unit transmits the corresponding data to the sound system amplifier control unit or the Midline sound system amplifier control unit via MOST.
The visual driving information is shown on the Audio/COMAND® display. In addition, views and menu displays can be displayed in the instrument cluster. The head unit generates the displays using the SD card data provided by the multimedia connection unit.
Updates on the SD card takes are downloaded externally on an Internet-capable PC; this is described in the operator's manual.
Card navigation
The head unit accesses the map data stored on the SD card.
When the SD card is used for the first time in the vehicle, data is written to a configuration file on the SD card by the head unit.
As GPS operates in the gigahertz range and the signals are weak, the following events may lead to reception interference: Atmospheric interference (e.g. bad weather, water vapor, fog), multiple reception through signal reflexions (e.g. on building walls) or signal shadowing (e.g. in built-up areas, in tunnels, in the vicinity of tall buildings of trees).
In the event of a failure of the GPS signals, the head unit reverts back to the basic position finding. For basic position finding, the head unit evaluates the data from the integrated gyro sensor as well as the reverse gear signal and the wheel speed signals.
The electronic ignition lock control unit transmits the reverse gear signal to the head unit via the user interface CAN.
The Electronic Stability Program control unit transmits the wheel speed signals to the head unit via the chassis FlexRay, electronic ignition lock control unit and user interface CAN.
Location faults during position finding, rolling backward with circuit 15 OFF or vehicle transportation falsify basic position finding. In both instances, the deviation is automatically corrected by the navigation processor integrated in the head unit upon reception of GPS data.
The upper control panel control unit transmits the control signals to the head unit via the LCP-LIN, Audio/COMAND® control panel (except code 446 (Touchpad only)) or touchpad (with code 446 (Touchpad only)) and TELEMATICS CAN.
The steering wheel electronics read the operation signals from the volume control switch on the head unit multifunction steering wheel button group directly and transmit them to the head unit via the steering wheel CAN, steering column tube module control unit, suspension FlexRay, electronic ignition lock control unit and user interface CAN.
The Audio/COMAND® control panel (except code 446 (Touchpad only)) and/or the touchpad (with code 448 (Touchpad) or code 446 (Touchpad only)) transmit the operation signals to the head unit via the TELEMATICS CAN.
The voice inputs are recorded by the driver hands-free system microphone and processed further directly by the head unit.
The left lower control panel transmits the operation signals from the volume control button (manual transmission) or the right lower control panel transmits the operation signals from the volume control button (automatic transmission) to the head unit via the LCP-LIN, Audio/COMAND® control panel (except code 446 (Touchpad only)) or touchpad (with code 446 (Touchpad only)) and TELEMATICS CAN. The head unit transmits a switch-on request via the TELEMATICS CAN and the generated picture data via the HSVL line to the Audio/COMAND® display.
The head unit transmits the information for the display in the instrument cluster to the instrument cluster via the user interface CAN.
In vehicles except code 367 (Live Traffic Information) with a valid subscription for real-time traffic data, the navigation processor in the head unit takes TMC traffic messages into account. The TMC traffic messages are transmitted by the integrated FM radio tuners to the navigation processor.
On vehicles with code 367 (Live Traffic Information) and valid subscription for real-time traffic data, the HERMES control unit receives real-time traffic data via the emergency call system antenna or via the left telephone antenna, right telephone antenna and telephone antenna splitter from the service provider, as long as it is in the geographical area, for which the traffic data service is made available.
At the end of the subscription or outside of the geographical area for which the traffic data service is offered, the radio traffic messages are evaluated for dynamic route guidance.
The HERMES control unit transmits the real-time traffic data via the WLAN antenna to the head unit.
The HERMES control unit receives position data from the head unit at regular intervals in the opposite direction. The HERMES control unit transmits the position data from the head unit over the emergency call system antenna or over the left telephone antenna, right telephone antenna and telephone antenna splitter to the service provider. The HERMES control unit thereby contributes to gathering the traffic information from which the SD card navigation then again benefits.
| Electrical function schematic for navigation system function | PE82.61-P-2056-97FBB | ||
| Overview of system components, Telematics | GF82.85-P-9999RF |