Hi any advice before sending to a dealer.

Car came in unable to switch ignition on, problem was intermittent and now permanent.

Remote keys X2, also stopped working when fault occurred.

Sent Eis and steering column lock for testing and tested ok.

Can't communicate with the car via dlc.

Tried donor battery, checked all fuses voltages,
checked for can network signal but both high and low read constant 8 volts, with no data messages. Disconnected abs,engine ecu, ignition key/lock and gateway module.

Any further tests I can do?

Thanks

Joe