My car has factory radio with CD changer in the boot, no subwoofer.
Problem is no sound after main battery replacement. Radio head appears to work normally, LCD is alive, stations appear on display, tone controls change normally.
Does the radio head drive speakers directly when no subwoofer option or does it also require a separate power amplifer?
In the boot fuse box is fuse F34, 30A, not blown, protecting a power amplifier that I have not located.