My 2003 BA XR6T. The Horn has suddenly stopped working?

I have never had a problem with it until now. (car is standard-no electrical modifications).

First thing is I checked all fuses-Pulled all fuses in the interior fuse box located above bonnet release & allso in the engine bay fuse box, All ok.

Replaced the horn relay, from fuse box located in engine bay-off another mates BA that works. - Still not working.

Removed horns x2 from front welded x-member, checked they were not blocked with dirt, insects etc, they should'nt anyway they point downwards, Horns ok.- Still Horns not working.

Sanded a little paint from horn mounting on welded front x-member, To aid as a better Earth point contact. -Still Horns not working.

Tried the Horns off my mates BA that work, put them on my car- Still no Horn.

Removed airbag from steering wheel, As thought there maybe a possibility that the connectors may have came loose. Everthing checked out ok, No issues there.

Tried the Pannic button on the remote, No Horn, but all hazard/indicator lights flash.

So I'm still scratching my head as to what the hell has gone wrong here.

Can any one help me out please, is there anything I have missed checking?

try some electrical contact cleaner on the wire conections going onto the horn, this has happened to a few falcons I have owned it will be fine 1 day then not work the next, spray it on the conections and it will most likely work again. if that doesnt work you will have to see if theres power at those conections with a circuit tester if theres no power there test if theres power at the fuse and go from there

Problem fixed, It was a bad Earth, from the horn mount. The car looks like it has had the x-member replaced by a panel beater but did not clean paint off enough to create a better earth.

Thanks mate for you input.