horn problems, Help needed

[cooa99]

Hi all,

Pressing my horn does not work on E53 3.0d and  Car is due back this friday  for MOT retest

Here are the fault testing that I have done so far.

1) The 2 horns work when powered from to the battery
2) While my daughter pressed the horn I connected a circuit tester in the bonnet to the wires going to the horn but tester does not light up
3) I checked the fuse box in the glove box to confirm presence of 12v supply. Also tested the 2 top ends of the 15A fuse  and can confirm 12v presence
4) Took the glove box out to get to the back of the fuse box where the horn & fuel pump relays are situated. swapped the fuel pump relay with the horn relay and the horn still does not sound at all.

So this leaves me with the steering wheel as the only place left to check. Are there any precautions that i need to take since this is where the airbag is situated? Not sure what exactly I will be testing here....

Any links to wiring diagrams for the horns circuit to see how it links together?

help really appreciated

Thanks

[cooa99]

Just thought to give an update on this in case anyone else is in a similar situation.

I took the airbag off the steering wheel and gave the other plugs a  good shake to make sure they are properly seated, also blew away what little dust I could find.

Connected everything together feeling that I have achieved nothing. pressed the horn and it works!

took a while to get there