Hello,
it sounds like the GEM is going out for the wiper/interior lights and the horn will be separate issue please start a new question for that.
https://www.2carpros.com/questions/new
Here are the wiper and interior light wiring diagrams so you can see how the work with the GEM with the location of the GEM which is behind he center of the dash so you can replace it.
Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
Cheers, Ken
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Wednesday, October 24th, 2018 AT 12:52 PM