9-3 Coupe (9400) L4-2.0L Turbo (B204) (1999)
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DICE And All Bus Systems Except EDC 15
DICE is connected with a communication lead to the data link connector pin 7.
The diagnostic tool communicates digitally and serially with the DICE. Digitally means that the voltage difference between the lead and ground has only
two values, in this case about 0 V and B+.
Serial means that the information is sent in "packets" which are transmitted one after the other in rapid succession.
As the diagnostic tool has contact with DICE, it also has access to all the bus systems except EDC 15 which has a separate K lead.
If, for example, MIU is to be contacted, the diagnostic tool first calls DICE.
This means that DICE must be powered (awake) so that MIU can make contact.
Diagnostics
If none of the bus Systems can be contacted then the fault must be either in the car or in the diagnostic tool.
If the diagnostic tool can make contact with any of the systems concerned in another car, the fault will be in the car.