Well if its a VX radio, Theres probably only one option.... A trip to Vauxhall with the car and radio. Vauxhall pair all their electrical items to the car's CPU. You cannot even whip the stereo from one Vx and put it in another. If a part is removed (including an airbag controller for example) it has to be unpaired before removal. If the radio you are talking about is newer than say an 02 plate, you are gonna struggle. You could ask on a Corsa website.