CORSA GL1.6 RADIO CHANGE AND DOES NOT WORK

Friends, I have a Chevrolet Corsa GL 1.6 which changes the radio for a Sony the connector is an ISO for what I was finding out, it has all the necessary cables but when putting the sheet in position 1 (where it should give energy to turn on the radio) and nothing happens there is nothing there is no voltage. I had to get 12v for memory (yellow cable) from the fuse box, but I dare not leave the radio directly since I can be burned. I am thinking that it can be the computer that is "turning off" certain qualities of the vehicle since I do not have ashtray, suitcase light, and 2 days ago there is without the buzzer of lights on, neither are fuses check them all. If anyone knows what the problem is appreciated very much their help.

The radio you took off before changing it to the Sony?

It is difficult for you to be taught to be heard but you would have to have current the computer does not block that type of current or suitcase or anything can be founded by the lights or a bad land.

Hello friends, finding out with an electric one I knew that the power sheet at point No. 1 where the steering wheel was uncovered (counting from 0 to 3) says that it is not designed to give current to the accessories.
Othoniel I don't really remember if I turned on before. I change it because it was damaged.
Kikemec now knows that it cannot have been .. fix the problem of the buzzer was the door switch that was isolated . And the door of the portamaleta did not have the blister.
And with respect to the radio I made a small circuit with a switch and a diode to work while I have the contact off.
Thanks for lending me a little hand!