The horn on my 2005 Kia Amanti stopped working?

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All here, including videos showing how to replace.

https://www.google.com/search?q=2005+kia+amanti+camshaft+sensor+location

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Don't know what model you have. 03-05 Amanti has fuse AV audio. fuse box diagram below.
https://www.autogenius.info/kia-amanti-2003-2005-fuse-box-diagram/
03-06 Sorento
https://www.autogenius.info/kia-sorento-2003-2006-fuse-box-diagram/
03-05 rio
https://www.autogenius.info/kia-rio-2003-2005-fuse-box-diagram/

2005 Kia Amanti ECM location. Drivers side directly to the right of the Gas Pedal. Remove plastic panel, roll back carpet and you will see it right there.

https://www.google.com/search?q=Where+is+the+fuse+for+the+rear+defroster+on+an+03+trailblazer&biw=1360&bih=650&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwj-xrzT8rfQAhXH7SYKHWDVCxQQsAQIKQ#tbm=isch&q=2005+Kia+amanti+lateral+rods

https://www.google.com/search?q=Where+is+the+fuse+for+the+rear+defroster+on+an+03+trailblazer&biw=1360&bih=650&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwj-xrzT8rfQAhXH7SYKHWDVCxQQsAQIKQ#tbm=isch&q=2005+Kia+amanti+rear+control+toe+link

Hope these help

Kia Amanti Workshop Owners Manual

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Idont know that heater display has its own fuse. Most likely its ?the bulb. Hope that helps

my guess is the BCM has a problem. There is a separate horn for the "lock chirp" under the hood on the passenger side. you can check for voltage at the horn but remember to hold in the hood ajar button or the test won't be accurate.

The evaporative emissions vent valve is stuck closed. Probably needs to be replaced.

id star by checking tire pressure air filter oil change wheel bearings brakes