9-3 Coupe (9400) L4-2.0L Turbo (B204) (1999)
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possible delay.
All the information sent from one control module is accessible for all other control modules on the bus. The MIU is responsible for ensuring that
information available on one bus is also available on the other bus.
The control modules send out information on the bus at regular intervals. The time between two transmissions depends on the information being sent and
varies between 10 milliseconds (0.010 seconds) and 1 second. Information is also sent out by the control modules whenever the information changes.
The transfer of information between control modules takes place on two leads, bus+ (green cable) and bus- (white cable). Both bus leads are twisted to
increase resistance to electrical interference.
Principle of Communication
Principle Of Communication
The bus may be regarded as a two-wire telephone line running between the control modules. With the ignition switched on, Communication goes on
continuously. With the ignition switched off, a control module that is operative may if necessary awaken the other control modules. This happens for
example when a door is opened and the TWICE, to which the door switches are connected, awakens the others so that the DICE will be able to switch on
the interior lighting.