| Pos. | spare part no | Name |
| 1 | - | Global Positioning System Antenna (GPS) |
| 2 | - | Beacon antenna for receiving messages from infrared and radio transmitters installed along the road (VICS) - Japan only |
| 3 | - | Infotainment control panel and control module |
| 4 | - | Touch screen display |
| 5 | - | Onboard audio module |
| 6 | - | Navigation system computer |
| 7 | - | AM Antenna Booster (amplitude modulation) / FM (frequency modulation) – non-diversity system, or AM/FM diversity antenna amplifier |
| 8 | - | sound amplifier |
| 9 | - | Antenna amplifier VICS/TMC |
| 10 | - | Dual FM Antenna Booster for Diversity Setting |
The navigation system provides audio and visual directions to guide the driver to their destination. The system allows the driver to choose the desired route, giving preference to major or minor roads, or motorways with a choice of one of three routes. In addition, the system contains information about hospitals, museums, monuments and hotels. Geographic maps and related information are recorded on a DVD disc, and the driver is offered the best route to travel with detailed descriptions of driving directions, intersections and detours.
The driver uses the touch screen to control the operation of the navigation system. Control signals from the touch screen are transmitted via the MOST bus (Media Orientated System Transport) to the infotainment system control module and from there via the MOST bus to the navigation computer. Navigation computer via dedicated GVIF interface (Gigabit Video Interface) sends a video signal to the touch screen.
On vehicles equipped with navigation systems, additional systems for receiving traffic information are also installed. The system model depends on the market:
- Europe - Traffic Channel (TMS).
- Japan - System for receiving messages from infrared and radio transmitters installed along the road (VICS).
- North America - No additional system installed.
Navigation system computer
The navigation computer, located under the right front seat, is equipped with a DVD drive for reading DVD maps (disc version varies by region). The DVD loading slot is accessed from the back of the seat.
The button next to the DVD slot is used to eject a DVD disc from the unit. Before ejecting a disc, slide the slot cover to the side. If the ignition is on or the infotainment system is in one hour mode, the DVD disc is ejected when the button is pressed once.
The navigation computer connected to the MOST bus generates its own graphic images and transmits them to the touch screen via a dedicated GVIF bus (Gigabyte Video Interface).
The navigation computer also includes:
- GPS receiver
- VICS receiver (Japan only)
- Traffic Channel Receiver (TMC)
The GPS receiver receives information from one to eight satellites at a given time. This information is received by the GPS antenna. The built-in GPS receiver is used to calculate the position (those. latitude, longitude and altitude), direction and speed.
The navigation computer contains a semiconductor piezoelectric gyro sensor that measures the movement of the vehicle along the vertical axis. The gyro sensor works on the principle of the Coriolis force. The Coriolis force is the force that arises to accelerate bodies moving from an axis of rotation in the direction of rotation of the axis.
To calculate the current position of the car, the direction and speed of its movement, the computer uses:
- speed signals transmitted over the high-speed CAN bus from the ABS module to the MOST bus
- signals transmitted from the GPS receiver and gyro sensor
For the Japanese market, the navigation computer is equipped with a VICS receiver. The VICS receiver receives information from the VICS beacon antenna located in the center of the instrument panel and from the FM electrical antenna. VICS uses this data to monitor traffic information from roadside transmitters and adjust the route if necessary to avoid traffic jams.
For some European countries, the navigation computer is equipped with a traffic channel receiver (TMC). The TMC receiver decodes the TMC data. The navigation computer then displays this information on the touch screen and changes the navigation system input to avoid traffic jams. The TMC data is sent to an FM electrical antenna.
The navigation computer uses non-volatile memory to retain settings and configuration data when the system is turned off. Memorization is carried out immediately before switching off.
Touch screen display
The touch screen is located in the center of the instrument panel and is a dedicated navigation system interface. The touch screen is not designed to work with any other vehicle systems. The screen is a liquid crystal display (LCD) with a diagonal of 7 inches; its resolution is 800 x 480 pixels, aspect ratio is 15:9. The touchscreen is connected to the infotainment system via the MOST bus. MOST is a fiber optic bus designed for high-speed transmission of commands and audio in a multimedia system.
The touch screen processes its own video signals, however, all graphical navigation information comes from the navigation computer via a dedicated GVIF serial bus (Gigabit Video Interface).
Navigation control signals from the touch screen are transmitted via the MOST bus to the navigation computer.
Global Positioning System Antenna (GPS)
Global Positioning System Antenna (GPS) located at the rear of the car roof. The GPS antenna is connected to the navigation computer with a single coaxial cable, receives signals from the GPS satellites and transmits them to the receiver built into the navigation computer for processing.
The GPS antenna may lose signal from GPS satellites:
- In the hilly area and in the avenue with tall trees
- In the area of high-rise buildings
- In multi-storey car parks
- in garages
- in the tunnels
- On bridges
- During a rain or thunderstorm
In this case, the navigation system continues to operate until communication is restored, based only on the information recorded on the DVD.
For more information, see the chapter: Antenna (415-02, Description and principle of operation).
VICS beacon antenna - Japan only
The infrared VICS antenna is mounted on top of the control panel. The antenna receives signals in the infrared and radio frequency ranges from transmitters installed along the road. The antenna is connected to a navigation computer with a built-in VICS receiver.
For more information, see the chapter: Antenna (415-02, Description and principle of operation).
Infotainment control panel and control module
The control panel contains the audio system switches and the telephone control unit. The navigation system is controlled from the touch screen using signals transmitted via the MOST bus. When the hardware buttons on the control panel are pressed, CAN signals are transmitted to the infotainment system control module, which translates the signals to the corresponding MOST bus module.
The infotainment control module is the gateway between the medium speed CAN bus and the infotainment system MOST bus.
For more information, see the chapter: Audio System (415-01, Description and principle of operation).
Onboard audio module
The audio signals are sent along the MOST loop from the on-board audio module to the amplifier.
For more information, see the chapter: Audio System (415-01, Description and principle of operation).
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