OBC is the On Board Computer, this is the system that displays the fuel
consumption rate, average speed, time to destination, and others. It also
displays the time or the calendar depending on which of these you choose.
The OBC is also the display where you are warned of burnt out lamps and worn
brake pads. (I may be wrong on the pads, I've never worn mine out far enough
to see the display.)
The diagnostic system is OBD II, On Board Diagnostics, Level 2. The
diagnostics and the OBC are not interrelated, the diagnostics does not
display the time.
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