Stock Head Unit *Error* Codes

Does anybody have a list of error codes for this thing? A buddy of mine has the stock 6CD player on his '04 GTS and the radio works fine, it's just when the CD function is turned on nothings plays and an ERROR 03 comes up.

Any ideas?

sounds like he needs a new one. they go for cheap enough you can pick one up used perhaps online or something. I'm assuming nothing was changed? No CD's are stuck in the player? it just won't play,correct?

Sounds like trying to play a burnt cd that isnt recognized.