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The radio has two feeds - one live all the time, and one which is switched through the ignition. It seems like the permanently live feed has a fault (as inferred by your original post).
Check all the fuses in the cabin fusebox. Either remove each fuse in turn and check with a continuity tester, or check for 12 volts at both sides of each fuse (this can be quicker as you don't need to remove them all). The faulty one should only have 12 volts at one side.
Currently in mister_cee333's garage:
Toyota Avensis 1.8. Formerly Jaguar X Type Sport d 2005. Formerly 2001 Laguna 2 1.9 dCi