I found this.
If you do not want the radio to come on when you start up- heres what you have to do... Turn the key off, the radio is now silent, now push the on-off button-the radio is playing. Now push the on-off button again, radio is now silent and will not come on when you start the car. If you do not play the radio the next time you start it, the radio will stay off. If you play the radio while you drive, then you must repeat the process.
It is from another post. I don't know if it will work. I don't know how to link to the other post but if you will click on the word "search" at the top of the page and enter "radio problems" I think it will take you to the page.
