While the instrument cluster mainly indicates to the driver all important vehicle statuses, the on-board monitor is designed as an additional display for the driver and occupants. The indication and display system on-board monitor is intended to relieve the driver in selecting the most important indications/displays. The driving safety is not impaired since moving picture information (such as TV pictures) can only be seen when the vehicle is stationary. A further monitor for TV reception can be connected in the rear compartment.
Information relating to the vehicle, navigation, television, video recorder, video text, radio, telephone and sound can be shown in the on-board monitor.
The novel, additional display field contains following components:
Note
Functionally, the LCD on-board monitor (BM) and the video module (VM) belong together. A separate diagnosis program "video module" is available to perform troubleshooting on these components!
The electronic circuitry of the on-board monitor control panel (BMBT) collects information relating to key and rotary knob functions and makes it available on the I-bus.
During operation, light emitting diodes (LED) can be activated via I-bus data telegrams by the telephone, radio or by climate control electronics during independent heating.
The functions of the cassette drive are controlled by the on-board monitor control panel (BMBT).Activation of the cassette drive is triggered by I-bus commands from the radio.
The ambient brightness is measured by a phototransistor and, together with the information from the manual dimmer in the vehicle, the brightness of the LEDs and the button background lighting are controlled and a signal (PL signal) is produced for background lighting of the on-board monitor.
The on-board monitor control panel generates the operating voltages for keypad and cassette drive.
Switching on:
The on-board monitor control panel (BMBT) is switched on as soon as the ignition lock is in position 1 or when the I-bus is active or when the "CLOCK" is pressed in ignition lock position 0.
Telephone button:
Sending and concluding a telephone call. Relevant LEDs:
CLOCK button:
Switching ON/OFF on-board clock display in TV picture. The clock time can be selected also when the on-board monitor is switched off. The on-board heating/ventilation function can be switched off by pressing the button longer.The fan symbol above the button lights red if independent heating/ventilation has been programmed. The symbol flashes when independent heating or ventilation is currently active.
MENU button:
Branch to main menu on LCS on-board monitor.
On-board monitor rotary knob:
Selection of functions on LCD on-board monitor by turning the rotary knob. The corresponding function is activated by pressing the rotary knob.
Display button:
Permanent overlay of window for radio and clock in LCD on-board monitor.
Volume control:
Setting radio and cassette drive volume by turning rotary knob. The radio is switched on and off by pressing the rotary knob. The radio LED lights orange when the radio is switched on.
TONE button:
The adjustments for fader, balance, base and treble can be selected with the TONE button. Adjustment takes place with the search rocker switch.All sound settings are set to the centre position if the TONE button is pressed for 2 s.
SELECT button:
Selection of search rocker switch:
Search rocker switch:
Station buttons:
In radio mode: Selection of one of 6 stored radio stations
In CD mode: Selection of CD 1...6 in CD changer.
FM/AM button:
Selection of radio reception range between VHF and medium wave.
TP button:
Only road traffic radio stations are selected.
RDS button:
Digital station identification is displayed in radio window.
Dolby button:
Switching Dolby function ON/OFF. Selection between Dolby B and Dolby C by pressing button several times.
MODE button:
Selection between radio, cassette and CD mode.
Direction selection button:
Selection of direction of cassette drive.
EJECT button:
Cassette ejection.
A data telegram is triggered on the I-bus when a button is pressed. If the button is pressed longer, after a short delay time, a further data telegram "button still pressed" is sent. After the button has been released, a data telegram "button released" is sent.
The CLOCK button is designed in such a way that it can switch on while operating the on-board monitor control panel (BMBT).
When the EJECT button is pressed, in addition to the data telegram, the cassette is immediately ejected by the on-board monitor control panel (BMBT).
There is no reaction on the on-board monitor control panel (BMBT) if several buttons are pressed simultaneously.
In cassette mode, the radio buttons act as controls for the cassette drive. The button functions, however, still send the same data telegrams. The data telegrams are sent by the on-board monitor control panel (BMBT) to the radio. The radio evaluates the telegrams and responds also with data telegrams for operation of the cassette drive.
All buttons feature background lighting. The lighting is controlled directly with terminal 58g.
On-board monitor rotary knob:
Selection of functions on the LCD on-board monitor by turning the rotary knob. The corresponding function is activated by pressing the rotary knob.
Volume control:
Setting the radio and cassette drive volume by turning the rotary knob. The radio is switched on and off by pressing the rotary knob. The radio LED lights orange when the radio is switched on.
LEDs can have a steady light or flash.
The LEDs are switched on by I-bus data telegrams from the control units instrument cluster electronics (IKE), telephone and radio. After being switched on, the corresponding LED remains on until the on-board monitor control panel receives a corresponding I-bus data telegram to switch off the LED.
Telephone LED:
Radio LED:
The radio is switched on and off by pressing the rotary knob for volume control. The radio LED lights orange when the radio is switched on.
LED for independent heating/ventilation:
The fan symbol above the button lights red when independent heating/ventilation is programmed. The symbol flashes when independent heating or ventilation is currently active.
The cassette drive is a standard part such as in radio sets with integrated cassette drive.
The on-board monitor control panel (BMBT) transfers pressed radio buttons as well as the status of the cassette drive in the form of I-bus signals to the radio. The radio set then decides whether driver functions are to be controlled and sends corresponding data telegrams back to the on-board monitor control panel (BMBT). In turn, the on-board monitor control panel (BMBT) triggers the required action on the cassette drive. Any change in the status of the cassette drive is sent to the radio.
Exception: The cassette is ejected immediately when EJECT button is pressed. The EJECT data telegram is additionally sent to the radio.
The sound signals from the cassette drive are amplified as standard and transferred at audio frequency outputs to the radio for further amplification. Short-circuits do not destroy the audio frequency outputs.
The on-board monitor control panel features a 12-pin, blue ELO connector.
The lines for power supply, the I-bus link as well as the line for button lighting are routed to the on-board monitor control panel with cassette drive.
The audio frequency lines of the cassette drive, designed as twisted, non-shielded lines, are assigned to a part of the connector.
Only one connection line for switching on and off and for brightness control of the LCD on-board monitor (PL line) is routed to the monitor.
The on-board monitor control panel switches the LCD on-board monitor on and off via the PL line. The PL signal also serves to switch the background lighting of the LCD screen on and off.