Radio/cd doesn't work high pitched sound when turn on
Could be a radio chassis ground that is bad or the unit itself has an internal problem, you could check all the dash grounds most of those are located on either side of the dash crossmember. 7 years old, might not be worth messing too much with it, might be better off replacing it with an aftermarket unit.
Search Toyota Corolla Questions
Toyota Corolla Experts
Related Models For Sale
Used Cars for Sale