I had same problem - fuse in normal fuse panel was okay - went under the hood an replaced 7.5 amp spare fuse beside ECU fuse - it was blown there. replaced with another 7.5 and voila radio and clock now working again!!
Under dash fuse box fuse # 23 (15 Amp) is the cigarette lighter fuse direct to lighter yellow red wire becomes, white /blue to lighter, fuse also brings power to the stereo yellow/red wire.
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Have power to cig lighter, but none to radio constant hot or clock. Is there a joint or union of the wires where they change color? If so where?
if car lighter is not going but there is nothing wrong with the fuse which, also the car streo not going could the wires be burnt out