c5 x7 horn not working

[Agour]

Hi!

My new (to me) x7 has a few issues - one of which is the horn not working.

Checked the fuse and that's fine.

Lexia reports - "F997 - fault in the horn control circuit".

Does anyone know what the access it like to the horn - and what else I could look for to troubleshoot?

The rest of the controls on the steering wheel work btw.

Thanks!