Description

NAVIGATION SYSTEM

The navigation system comprises the following components:
^ Touch Screen Display (TSD)
^ Navigation computer
^ GPS antenna

In addition to the standard navigation system it is possible in certain markets to add:
^ Traffic Message Channel (TMC) system
^ Vehicle Information and Communication System (VICS Japan only)

Touch Screen Display





The Touch Screen Display (TSD) is located in the center of the instrument panel. The TSD is a touch sensitive 7 inch LCD VGA screen containing 800 x 480 pixels in a 15:9 format. The TSD is connected to the infotainment system on the Media Oriented Systems Transport (MOST) ring. The MOST ring is a fibre optic communications data bus that allows high speed transfer of control instructions and audio around the system.

The TSD processes its own video for system operation but receives the navigation graphics from the navigation computer on a dedicated serial link called GVIF (Gigabit Video Interface).

Connector No C2819 Pin Out Table:

Connector No C2820 Pin Out Table:

Connector No C2823 Pin Out Table:

Connector No C2825 Pin Out Table:

Navigation Computer





The navigation computer is located under the left hand front seat. The computer is the main component in the navigation system and receives inputs from the ABS Unit and the GPS antenna. The navigation computer contains a solid state piezo gyro which measures the motion of the vehicle around its vertical axis. The gyro operates on the principle known as the Coriolis force. The Coriolis force is the force that appears to accelerate a body moving away from its rotational axis against the direction of rotation of the axis. Using the inputs from the ABS unit, the GPS antenna and the gyro sensor, the computer calculates the vehicle's current position, direction and speed.

The navigation computer also houses the DVD-ROM drive. The drive is used to read map data from region specific DVD's (1 DVD for each of the following regions: EU, US, Japan and Australia). A button, located adjacent to the DVD slot, is provided to eject the DVD from the unit. If ignition is on, or the Entertainment System is in 1-hour mode, one press of the button will eject the DVD.

The GPS receiver receives information from between 1 and 8 satellites at any one time. This information is received from the GPS antenna. The built in GPS receiver is used for calculating the position (i.e. Latitude, longitude and height), direction and speed.

The navigation computer uses non-volatile memory to store settings and configuration information when it is powered down. This process takes place just before the computer turns off.

CAUTION: If the unit is disconnected before the Entertainment System has powered down, the computer could fail to complete its data storage. This means that personal settings could be lost.

For the Japanese market the navigation computer is a different component. Although it looks identical the software is specific to Japan market and the part number is different. The system also has extra components for the VICS system (a receiver and an antenna). The VICS system receives allows the vehicle to receive information about traffic conditions from roadside transmitters and adjust the navigation instructions accordingly. The VICS information is received by both a radio link and an infra red link. For this reason the antenna is located on the inside of the windscreen.

The navigation computer is connected to the TSD by a private CAN bus and a dedicated GVIF (Gigabit Video Interface). The GVIF carries all the video information to the TSD, while the CAN bus is used for data and control instructions to and from the TSD.

Connector No C2114 Pin Out Table:

Connector No C2113 Pin Out Table:

Connector No C1599 Pin Out Table:

GPS Antenna





The GPS antenna is located in a pod which is in the in the center on the vehicle roof at the rear. The GPS antenna is connected to the GPS computer by a single co-axial cable and passes signals from the GPS satellites to the navigation computers built in receiver for processing.

It is possible for the GPS antenna to lose the GPS signal from the GPS satellites in hilly or tree lined areas, built up areas with tall buildings, multi storey car parks, garages, tunnels, bridges and during heavy rain/ thunderstorms. When the signal is lost the navigation computer will continue to give guidance using memory mapped data from the DVD map until the signal is restored.

Traffic Message Channel (TMC) Receiver





The Traffic Message Channel (TMC) receiver is located in the rear RH side of the luggage compartment. The TMC receiver is connected to the MOST ring and transmits TMC data to the navigation computer (via the TSD). The navigation computer then displays this information on the TSD and also re-routes the navigation guidance around any traffic hold ups. The TMC data is received via the FM antenna located in the rear screen via an antenna amplifier located above the rear tailgate spoiler.

TMC is available in many European markets.