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 aerial diversity as well as the change over for video, audio and RGB signals.
The video module is a 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.
The aerial diversity function integrated in the video module always ensures the best possible reception when the vehicle is stationary.
The aerial always finds the best reception on the basis of certain criteria. It consists of 2 window aerials with amplifiers and the diversity function in the video module.
The aerial amplifiers are powered short-circuit-proof by the video module via the aerial sockets.
A TV receiver with video text decoder is integrated in the video module.
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.
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.
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.
If no navigation system is installed in the on-board-monitor system, the video module builds up the graphics for the menus (user interface).
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 monitor and the NF lines through to the radio.
After replacement, the video module must be encoded with ”Coding ZCS”.