That White wire continues on the next page to the Radio Conn., half way down the right side.
Also connected to this terminal is the Red-TR wire that goes lower on the page and back over to the first page.
On the first page, the Red-TR wire goes to the end fuse in the fuse block. They are not labelled, but I'd guess that checking the fuses, especially the end on that might be marked Radio, would help!