Video Module, Picture Signals, Output (VID Video Module)

Video Module VM2 & VM5

Video module
For the driver, the on-board monitor system represents a central information medium, providing him/her with data in a uniform format which is necessary or of assistance for driving.

The video module is a component part of the on-board monitor system.

The video module contains the TV receiver with videotext function and antenna diversity as well as the change over for video, audio and RGB signals.

The video module is an K-bus user and has self-diagnosis capabilities.

The video module controls the LC screen via RGB lines. Depending on the mode of operation, the sound for voice output of the navigation system (if installed) is switched through to the output of the AF lines to the radio.

If no navigation system is installed, the video module builds up the graphics for the menus on the on-board monitor (user interface).

At every ignition ON, the video module recognizes whether a navigation system is a component of the composite system and it behaves accordingly.

Components

Antenna diversity
The antenna diversity function integrated in the video module always ensures the best possible reception when the vehicle is stationary.

The antenna always finds the best reception on the basis of certain criteria. It consists of 2 window antennas with amplifiers and the diversity function in the video module.

The antenna amplifiers are powered short-circuit-proof by the video module via the antenna sockets.

TV receiver incl. video text
A TV receiver with video text decoder is integrated in the video module.

Picture
The video module sends picture signals via three lines (RGB lines) to the LC on-board monitor..

If installed, the navigation system sends the picture signals to the video module. This possesses an internal employees selector switch that switches between the navigation screen/menu and TV picture.

Sound
The video module is linked via AF lines to the on-board radio which amplifies the signals and outputs via the speakers.

The radio internally switches over the sound signals from the radio to TV/navigation when it receives corresponding information from the video module via the K-bus.

If there is a navigation system in the composite system, the navigation computer sends the sound signals to the video module and this switches internally between TV and navigation sound.

System configuration
There are two possible variants of the on-board-monitor system in which the video module is fitted.

Here, at every ignition ON, the video module recognizes whether a navigation system is fitted and it behaves accordingly.

Without navigation
If no navigation system is installed in the on-board-monitor system, the video module builds up the graphics for the menus (user interface).

With navigation
If a navigation system is a component part of the on-board monitor system, the user interface is set up by the navigation computer.

The navigation computer is linked via RGB (picture signals) and AF (sound signals) lines with the video module. If required, this switches the RGB lines through to the LC screen and the NF lines through to the radio.

The video module 2 in the workshop

Encoding
After replacement, the video module must be encoded with "Coding ZCS".