20
On-Board Monitor and Navigation Systems
Principle of Operation
The on-board monitor is an input and display device that performs no internal calculations.
Inputs from the control panel buttons and knobs are converted into I-bus (K-bus E46)
signals by the BM control panel. All of the devices controlled by the BM are connected to
the I/K bus interface.
The navigation computer contains the graphics stage integrated into the navigation
computer housing. Request for on-board monitor displays are made to the navigation
computer via the I/K bus. The navigation computer generates the RGB video signals and
transmits them via 3 shielded wires.
Audio signals generated by the cassette drive are sent via traditional audio wires (4) to the
radio (located in the trunk or cargo area) for output to the audio system amplifier.
Workshop Hints
Service mode
Access for the radio, on-board monitor and navigation service modes is available through
the on-board monitor screen.
To enter the radio service mode:
Turn the ignition key to position 1 (KLR).
Turn the radio on, then off, then on again.
Press the INFO button. From the selection list choose RDS.
Press and hold the on-board monitor control knob for at least 8 seconds.
The audio display window will show the radio serial number as the first display.
The station search < > buttons are used to scroll through the various settings.
Turn off the radio to set any changes made.
Note: See the NG Radios
module for a list of the
tests and settings available
in the radio service mode.
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