Shown on model 222, 217 |
A2/94 | DSRC antenna |
A40/3 | COMAND control unit |
A40/8 | Audio/COMAND display |
A50/6 | Dedicated Short-Range Communications control unit |
N40/3 | Sound system amplifier control unit (with code 810 (Sound system) or with code 811 (Advanced sound system)) |
N73 | Electronic ignition switch control unit |
CAN A | Telematics CAN |
CAN HMI | User interface CAN |
MOST | Media Oriented System Transport |
LVDS | Low voltage differential signal |
P82.88-2035-76
Function requirements for Dedicated Short-Range Communications in general
Circuit 15R ON
Electronic Toll Collection System (ETC) card inserted
Dedicated Short-Range Communications in general
The Dedicated Short-Range Communications (DSRC) system combines the following functions:
Payment of toll fees from the vehicle in the Electronic Toll Collection (ETC) system
Use of Vehicle Information and Communication System (VICS) services in the reception range of 5.8 GHz
The ETC system encompasses not only payment at the tollbooth but also a detailed list of payments made.
The services provided through the VICS include e. g.:
Warning of obstacles in stretch ahead
Information on traffic conditions in stretch ahead
Warning if separate lanes are merged in the stretch ahead.
Electronic direction signs
Function sequence for Dedicated Short-Range Communications
The DSRC antenna and the Dedicated Short-Range Communications control unit are installed in the vehicle for transmitting and receiving data. The DSRC antenna allows the Dedicated Short-Range Communications control unit to communicate with the toll clearing station and to receive the VICS information in the 5.8 GHz range.
A special ETC card is required for the ETC system and it has to be inserted in the Dedicated Short-Range Communications control unit. All information concerning the user and the fees that have already been paid are stored on this card.
On the vehicle side, the Dedicated Short-Range Communications control unit is connected via a universal serial bus (USB) interface to the COMAND controller unit. The voice outputs and display messages of the ETC and VICS functions are forwarded to the COMAND controller unit via this connection. The Audio/COMAND display receives the picture signals for the display messages via an LVDS line from the COMAND controller unit. The COMAND controller unit forwards the audio signals to the speaker system. In vehicles with CODE 810 (Sound system) or CODE 811 (Advanced sound system), the COMAND controller unit forwards the audio signals over MOST to the sound system amplifier control unit, which actuates the speaker system.
In the following cases, an ETC voice message is emitted through the speaker system:
ETC card not inserted.
ETC card read error
ETC card not accepted.
ETC card reader error
Fault in the communication with the tollbooth
Detailed information about recent toll payments available.
Current information on road and traffic situations available.
In the following cases, a visual ETC message (pop-up) is shown on the audio/COMAND display:
COMAND controller unit booted and ETC card not inserted
COMAND controller unit booted and ETC card inserted
Feedback from tollbooth