If your car has command for the regulation of the luminosity of the instruments, it may be that.
Right now you don't tell me if it is a Corsa A or a Corsa B. and I suppose you have looked at the two fuses of 10 to (red) with the drawing of the position of position and that they are fine. If they were not, in addition to what happens to you, you would fail the position of one side of the left car. or der.
If so and it is the Corsa B, (the round) the command of the luminosity of the boards is next to the sowment inclination, under the light switch and above the antiniebla buttons, to the left of the steering wheel.
I hope I have helped you.
Receive a cordial greeting.