Have a 2000 GTV 2.0 TS. Failed MOT as horn does not work.
Have done the obvious, checked fuse, switched relay, put feed to horn units and they work etc.
From playing around the relay has 12v going through it all the time it just needs the switch in the steering wheel to earth it to allow the relay to operate.
Removed airbag on wheel and stated checking the horn switch. Seems to operate ok, have 12V up to it(from the relay), and the switch works fine. However, as far as I can tell, although there is 12v feed to the horn through the slip ring, there is no earth for it. As far as I can figure out it must earth through the steering column itself
If I use a length of wire to earth the column and base plate of the steering wheel, the horn works fine.
Anyone come across this before? Without access to any wiring diagrams I am a little lost, is there some sort of earth on the column further down? Or am I missing somethng obvious?
Thanks in advance.