9-3 Coupe (9400) L4-2.0L Turbo (B205) (2001)
If TCM is contacted, the diagnostic tool will first call DICE and request diagnostic communication with TCM. DICE transfers the diagnostic tool request
to the I-bus, whereby MIU will transfer the diagnostic request to the P-bus and TCM.
This means that DICE and MIU must both be powered (awake) in order to contact TCM.
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.
For further information on fault diagnosis of diagnostic communication with DICE or any other bus-connected system
See Diagnosing the bus. See: Bus Diagnosis
DICE and all systems connected to the bus except the diesel engine control module