What a day!
To get access to the horns removed the wheel and wheel arch liner, then had to remove the expansion tank and windscreen washer bottle. The bottom bolt was an absoloute pig to get to, took forever. Tested the horns. No 12v when the horn push is pressed.
Checked the fuse - OK
Swapped the relay - no difference
Noticed that there seemed to be a circuit between the black and purple wires on one iof the horns but not the other - not sure what this means.
Put the car back together.
Disconnected the battery, removed the airbag from the steering wheel
Removed the "Horseshoe" and opened it up
Noted no circuit between the red wire and the 2nd pin from the right on the top row ( Thanks to previous posters re similar problem)
Soldered a wire in place to make the circuit
Tested it to make sure I had not shorted across the adjacent pins
Put it back in the steering wheel
Replaced the airbag
Re-connected the battery
Still doesn't work!
Any help much appreciated.
147 Jtdm Collezione 2009