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I believe I know your problem. All 12 fuses have no power (from F4 to F15),. Read this:

I was right about the ignition switch pin2, which supplies 12v to the following 12 fuses: [F4 to F15], including the horn control input to the horn relay. So the radio, GM5, seat-belt Hall-sensors, headlight control switch and many other components are affected by this pin2.
 
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