Horn Assembly problems of the 2011 Toyota Corolla

Vehicle horn stopped working. Not sure what caused it to stop working. I have not used it that often, but this recently happen when I was merging onto the highway and another vehicle almost ran right into me and my horn did not work to warn them I was there. This makes me nervous in case something does happen with my child in the car.

I was driving to work on a city street when a vehicle changed lanes without warning into my lane. My first reaction was to honk as I swerved to avoid being hit. The horn did not work, thank god my there was enough room for me to move to avoid being hit. I have taken my car in for the air bag recall to the dealership to be fixed. I'm wondering if something could have happened to the spiral cable then or if it is just a faulty equipment. Went I got home I kept trying to make my car honk and I noticed when I turn my steering wheel a certain way it honked. I took my car in for service and asked about the horn and was told there would be a $200 fee to diagnose the problem and that money would go towards the cost of getting it fixed. I asked what the maximum cost would be he said $400. So they diagnosed my vehicle and said the part is $600 and I had 2 weeks to decide. I believe this is a safety issue and I shouldn't have to pay anymore money to have this fixed. I have talked to many people with the same problem. I believe Toyota should correct this safety issue before someone gets killed! a horn can make a life or death difference.