I have this vehicle that will not attempt to start.
Insert the card, there is a click, then all that happens is the immo Led lights constant. Nothing else at all on the cluster, not a single light.

Using the clip, during network test the lights on the cluster, mileage etc all light up, but on completion of test it reports no comms with instruments.

The card & the reader both ok. I can trigger the ignition relays manually and the dash lights up also, but I have no Neg output to the ignition relays from the UCH. I am suspecting this is where the fault lies but am keen to hear of anyone else's past experience.
I have checked the archives and there is a thread with my exact same symptoms from Chris Angus, but no fix.

Any ideas gratefully accepted.

Thanks.