Horn not working
I'd check the fuse first. That's the simplest fix if it's blown.
Locate the horn, check for 12 volts applied to the horn when somebody pushes the steering wheel horn switch. If you have 12 volts at the horn then the horn is bad. If you do not have 12 volts at the horn then a fuse, relay, wiring or horn switch is probably the problem.
Try this link....https://www.youtube.com/watch?v=FLP9NQ_tW1E.
Engel...did you ever find the problem with these horns?
Looking for a Used Camry in your area?
CarGurus has 97,664 nationwide Camry listings starting at $1,250.
Search Toyota Camry Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Toyota Camry Experts