Video Output

Video Output

The video output function for
- television (teletext to be available later)
- processing video signals from a DVD source
is provided by the video module 5 in conjunction with other systems.

Brief description of components

Video module 5
The video module 5 controls the internal antenna diversity unit and the screen with or without the navigation system option. The video module 5 also processes the sound for the TV function. The video module 5 is a MOST network node.

MOST bus
The MOST (Media Oriented Systems Transport) bus links the audio, video and navigation systems. Information relating to function requests is transmitted to the relevant control modules by means of MOST bus messages.

Window antennas and amplifiers
There are two TV antennas integrated in the rear window. The TV signals they receive are filtered and amplified by the antenna amplifier.

The antenna amplifier receives a short-circuit proof power supply from the video module via the antenna sockets.

Control Display (CD) and Controller
The Control Display displays the navigation system information and the control options for the navigation, audio and video system functions. Operation is by means of the controller located on the front of the center armrest.

The control display coordinates the function requests from the system and assigns them to the relevant functions.

Main functions

Video module 5 control tasks
The Video module 5 controls
- the internal antenna diversity module. The TV antenna diversity unit is integrated in the video module. The TV antenna diversity unit ensures that the best possible reception is obtained. The TV antenna diversity unit in the video module connects the antenna with the best reception to the video output.
- the screen without optional extra Navigation: The Control Display (CD) is activated via RGB lines. If the request "TV" is received from the Control Display, the video module switches to TV.
- Screen with optional extra Navigation: The video module outputs the TV picture as a CVBS signal to the navigation. The navigation system converts the signals and passes them to the Control Display via the RGB lines. If the request "TV" is received from the Control Display, the navigation system switches to TV.

The video module also processes the sound for the TV function and sends it via the MOST network to the ASK as an audio signal.

Control Display control module function
The control display is the only control module which knows which function is currently active on the system. If the volume is to be increased (function request), the Control Display sends a messages to that effect to the ASK/amplifier. This telegram also contains the information indicating to which audio source the volume adjustment applies. Infotainment audio output is always a certain amount louder than the entertainment sources.

Radio/TV/Navigation system sound output
The video module is connected to the ASK (audio system controller) via the MOST bus.
The ASK outputs the audio signals to the speakers.
The ASK switches over from radio sound to
- TV function or
- Navigation system
if it receives the corresponding information from the Control Display via the MOST bus.

Radio/TV mute function
The "mute" function turns off the radio/TV sound. The mute function is activated on the ASK by receipt of
- telephone calls
- navigation system announcements
- traffic news bulletins

If a traffic news bulletin is received when the radio has been muted, the radio is not demuted. The traffic bulletin is suppressed.

Notes for Service department
The self-diagnosis function on the video module 5 is initiated every three to five minutes. At worst, a fault may be present for 5 minutes before it is stored in the fault memory. It is possible to start a fault memory search (self-test) in order to check on work carried out.

Country-specific version

Japan
CVBS signals are decoded by the video module because the Control Display can only process RGB signals. If the Japan navigation system option is fitted, the navigation system uses a video module RGB input. The navigation system data is passed to the Control Display by the video module. Direct connection of the Japan navigation system to the Control Display is not possible because the video module adapts the data.