Right you might all hate me for this lol, but i have a corsa c, its half canbus like the vec c, and i have recently bought a new cdc40 hu from a dealership, and i have a GID from a facelift vec c. I have installed them, and they work to a degree. Basically they both come on, i can control the screen with the hu. However the canbus functions dont work, ie. ignition logic, temperature reading, ice warning, fuel range, trip computer, and the timer only works on "travel time". Also the hu does not light up with the headlights and the steering wheel controls dont work. I have had it coded by vaux, and they managed to get "display safe" and "headunit safe" to stop displaying. They said they have got the hu to interact with the screen, just need to get them both to interact with the car. We came to a joint decision it must need a different code index, but we dont know what they are. Can anybody suggest what the code index should be please?