Specifically l need to know which one controls the radio.

Go to a junk yard or a dealer and ask to look at the book. If they wont let you or do not have one you will have to do it the old way, 1 fuse at a time, which would in most cases be quicker than going someplace and tying to bum a read. There may also be a separate use on the radio a round glass one.

the best way to check them ''ALL'' is with atest light, many times you are noyt able to see the break in a fuse
l do not have a schematic for that partiular vehicle.

The engineers at Peugot are also looking for it.