So i have the infamous radio error on my 03 sedan, and it really didn't matter because I switched to double din shortly after. however im returning the car back to stock for trade in, and am now stuck with this problem. so i have some questions.

1. does this mean that the problem lies with the electronic board (the board with the a/c controls and radio controls)?

2. The cd changer was scrapped, so will a bose cd changer still work?

3. Will non bose speakers from an 03-04 g coupe fit the sedan?

thanks guys!