Just wondering, if (p0171) System to lean bank 1, warning lite came up as I had a vacume leak in the cruise control.I did repair it and the cc is working. The horn on the other side is still acting up, I found a blown fuse, replaced it, it worked once, fuse didnt blow.Once the truck is off for a while, it works once, thats it.Could this be a bad relay?

Thank you for looking

 

What do you mean by "horn on the other side"? The left button works and the right doesn't or vice versa? Also, when you say "works once" does that mean it beeps once and blows the fuse or beeps once and doesn't blow the fuse, but you need to shut the truck off and on for it to work again?