Radio confusion

[Traco]

Apt timing as I am confused on this also.

I have a 2003 S with CDR23 and a CDC-4 in the frunk. I get a protect error regularly now. If the car has been left for a few hours there is no problem as the system has gone to "sleep" and wakes up OK from what I can gather. If I turn it off and restart then no radio.

I have looked in the frunk and cannot see an Amp, its a non bose with only the speakers in the dash. I pulled the head unit out last summer and there is a fibre optic. I need to investigate closer but I wonder if I don't have the Amp are my speakers connected directly to the head unit and the fibre optic is the comms to the CDC-4.

Does every car have an Amp or maybe they didn't?? If not a head unit swap might be straightforward for me? I suspect the protect error is being caused by eh CDC-4 as it shuffles CD's like playing cards but won't play anything so reckon its passed its best before date.