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Hello welcome to just answer I am master tech and will be able to assist you.
when you say it's wont start please explain.
does it crank over but does not start or does not crank at all ?
ok with this new information I got a hunch you might be having a failing ignition switch harness.
have not see a relay cause that since the radio back up is direct via the fuse box.
not possible a fuse box ? have not seen one fail to date but these are getting older so anything is possible.
let me look over the etm when I get back home