Description
Video System
NOTE:
A = Hardwired I = CVBS N = MS CAN O = LIN P = MOST T = Coaxial AB = Bluetooth(R) AE = LVDS AG= Infra Red
AUDIO/INFOTAINMENT SYSTEM OPERATION
Media Orientated Systems Transport (MOST)
The components of the audio/infotainment system are all connected on the Media Orientated Systems Transport ( MOST) ring. The MOST ring is a fibre optic communications bus for multimedia applications. Audio and control information is passed around the MOST ring and can be picked up by any of the systems units. For example, radio station tuning/selection input by the vehicle user into the Touch Screen Display (TSD) is sent along the MOST ring and collected by the Integrated Audio Module (IAM) which then selects the requested radio station.
MOST technology uses a plastic optical fibre which forms a network connecting the audio and multimedia system components. Each component in the ring is connected to the plastic optical fibre through a device known as a Fiber Optical Transceiver (FOT). Each FOT has two optical connections; one connection is sensitive to light and is the input, the second connection forms the light source and is the output. The system operates by connecting the output from one FOT to the input of another FOT.
The light signals are sent in one direction only and are formed in the following way:
- Electrical signals are converted into an electrical current
- The current then drives an LED (light emitting diode) in the FOT to produce a high intensity red light
- The LED (light emitting diode) transmits the light through a fiber optic cable
- A photo diode in the FOT at the opposite end of the fiber optic cable detects the light.
The following components may be connected to the MOST ring dependant on the vehicle equipment level:
- Touch Screen Display (TSD) (MOST timing master)
- Integrated Audio Module (IAM)
- Rear Seat Entertainment (RSE) module (if fitted)
- Digital Audio Broadcast (DAB) radio receiver (if fitted)
- Satellite Digital Audio Radio Service (SDARS) (NAS only - if fitted)
- Power audio amplifier
- Instrument cluster
- TV module
-
Rear Seat Entertainment Control Module
The RSE module is located behind the rear seat backrest and manages the request signals from the remote control. The module is connected directly to both rear video displays via a medium speed CAN link. Infrared signals are received at the rear screens in the front headrests and user requests are communicated via the medium speed CAN link to the RSE control module. Video signals are communicated via the LVDS (Low Voltage Differential Signal) to one or both screens as requested.
IAM (Integrated Audio Module)
The IAM is located in the Instrument panel and incorporates the following systems:
- HD Radio (where fitted)
- Bluetooth(R) receiver (telephone and audio streaming)
- 40 Gb Hard drive (Navigation and audio ripping)
- USB controller (front)
- Audio AUX
- CD/DVD player
TV Module
The TV module is a known as a hybrid, which means it combines digital and analogue reception. The digital element receives all the same channels as available through the domestic Freeview system and shows information such as current channel and programme name. There is also a 'now and next' EPG (Electronic Program Guide) which displays the present programme being viewed and the next scheduled programme along wit the start and end times.
The same TV module is used for all markets except Japan, and is compatible with most mpeg2 (Moving Picture Experts Group - 2nd standard) digital formats. The appropriate analogue format is set based on the country selected from a menu list, via the Touch-screen TV settings.
The system offers a choice of aspect ratios, between the standard 4:3, 16:9 and zoom to fill the screen that are transmitted with the tuned channel. If the format is unknown (typical for analogue) then all three format options will be displayed, similar to the choice with a typical domestic receiver. The XJ screen offers picture quality using a resolution of 800x480 pixels for single view and 400x480 pixels for dual view.
Rear Seat Entertainment Remote Control
The remote control can be used to control the radio, CD/DVD, plug-in audio devices, and TV, by displaying options in the touch screen remote, which activates menus on screens within the head restraints which are navigated using the five-way button switch on the remote. For example, the user can press a soft key in the remote to activate the list of available radio stations in the headrest display. The user would then operate the five way switch to browse the list and select from it.
As part of the PDI process an initial setup procedure for the remote should be carried out (language etc.). This can be done with the handset docked in the cradle. The battery must then be installed by the selling dealer. Situated behind the battery cover is a hard-reset button. Prior to customer handover it should be ensured that the battery is subject to at least a 50% charge cycle (minimum two green segments of battery indicator).
When docked, communication from the handset takes place via two data lines into the RSE control module. This link also enables software updates and configurations sent from the RSE module, for example, a language change requested by the user. This link from the ECU to the docking station is a basic two-wire interface designed for remote control data rates (approx 38Kbit/sec.). It is protected against short to battery or ground on the output pin.
If the handset is used remotely, then infrared transmission takes place between the rear screens and the handset. User requests are passed onto the RSE control module to be processed via a private MS CAN link.
The remote control has three power modes:
LCD Screens
The RSE LCD screens are located in the rear of the front seat head restraints. The screen is secured in the head restraint with 2 clips and a screw which are covered by a removable surround. The screens are a 8 inch, auto dimming, high resolution LCD (liquid crystal display) monitors.
The LCD screens receive infra-red transmissions from RSE remote control and passes them to the RSE module via the medium speed CAN (controller area network). All screen settings can be changed using the RSE remote control.
The screens should be cleaned with a lightly, water moistened cloth. Do not use chemical agents or domestic products to clean the screen or any part of the surround.
Dual View Touch Screen Display
NOTE:
Due to legislation the NAS markets will not receive this option. A single view display is also available.
The dual view screen allows the passenger and driver to view different images from their respective seating positions.
To access a moving image when the vehicle is in motion and single view is selected, the dual view hard key should be activated by either the driver or the passenger.
Before and after dual view key activation
