I got stock horn in my civic 05. A month ago, the sound of horn changed so last weekend, I removed the bumper of the car. First I removed connector of left horn to see if right was working and it was working. Then I did same with other horn and both were working.
So I simply unbolted right horn, adjusted its screw a bit to change the sound. tested the horn with a spare battery I had and bolted it back on. Some 2 days it worked perfect, now the issue is that sometimes the right horn works, some times it doesn't (random).
I checked relay (while both horns were disconnected) and it looked and sounded fine...
What might be the reason for it? I can open the bumper again to have a look but any ideas what might be wrong?
Do both horns have one common switch (inside steering) or both got different... Any suggestions for troubleshooting it?