Some further info to this...
With the non-original instrument cluster in the car, this was reported by the T4;
With the original instrument cluster back in the car, the same was reported, so I used the T4 to reconfigure the cluster, and never saw this message again.
However there is a problem to communicate with the Immobilisation ECU when trying to run a full diagnostic;
Other modules on the K-Bus are communicating, and the module is functional, as in the car starts & runs, the steering column lock is released, and so on, but no comms on the K-Bus to T4.
With the T4 being what it is, it's difficult to do much with it when a module isn't talking...
I'd like to run a jumper wire from the Immobilisation ECU K-Bus terminal to another location on the Bus to see if it's a wiring fault, but to access the module the whole centre console has to come out...
There are also several CAN errors reported from the Air Suspension and ABS modules. I find it hard to believe that fitting a non-matching instrument cluster could cause ongoing faults, but then again I was surprised to learn that it even started with the wrong cluster fitted, so who knows...
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