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Sounds like a relay stuck. It should say which one it is in the owners manual or a chilitons. You could swap out another relay to check but I have had that happen before.
Today when i got home from work and shut hte truck down I could hear relays behind the dash in the middle clicking. I wonder if I have the leaking windshield wows.
mine does the same thing, Ryder, when its been raining. Come out and find my windshield all fogged up from it running. Sometimes the horn/alarm sounds off too.
Mine did the same thing when it rained. I read that the windshield leaks into the GEM module and that caused my blower motor to run. It dried out on its own and had the windshield leak fixed.