Dispatch horn - where's the relay?

[sibo]

Newbie here, hope someone can help!

2016 Citroen Dispatch, the horn's stopped working. Has had recent alarm issues, may be related, but I hope not.

The fuse box/BSI has a Horn fuse, which has blown. Replace it and it blows again. Disconnect the horn unit itself, replace the fuse, it blows again.

I can hear a relay click when pushing the horn, sounds to be from the BSI, but I could be mistaken and hearing something through from under the bonnet. The only relay I can see near the BSI is red, makes no difference if I remove this, I still hear the click when pushing the horn.

When I found a fuse plan, this shows "Horn" for fuse F22 in the under bonnet fuse box, but I have no fuse there. I've never taken anything out of there either.

Does anyone know if the BSI has integrated/hidden relays inside that might have something to do with the horn? If so, any possibility of replacing it, or the whole BSI? Are they coded?

So many questions, sorry. Why the frig are modern vehicles so complicated?

TIA

[Bigbear1976]

Hi, did you ever find the relay on your dispatch. I also can not find the relay, my horn is not working.
Thanks

Hi, my horn has stopped working, I've done a few tests on the circuit and now need to trace the relay. I've hunted high and low and can't find it, looked in fuse boxes but nothing. Can anyone help please