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Citroen AX - jimget
Where is thev fuse for the horn on a Citroen AX?
where is Citroen AX fuse box - jimget
Where is the fuse box

{as this question relates to your last one, I have combined them together. DD}
where is Citroen AX fuse box - Caveman
I take it you don't have a handbook, so it's pointless me telling you to RTFM ;o)
where is Citroen AX fuse box - Kingpin
I assume the horn has stopped working? Check if anything else has stopped, this would point to a fuse blown which controls several circuits. If not it may be a rusty connection at the horn etc or dirt at the terminal.
I guess that the fusebox may be under the dashboard, either behind a plastic panel near the steering wheel, or somewhere on the opposite side under the glovebox.
Citroen AX - Clanger
If the car is 1991 or later the horn fuse is behind the panel on the right of the dash between the steering column recess and the door pillar. Its numbered 10 and should be a 20 amp fuse.

It's more likely to be the horn itself if it's stopped working.
Hawkeye
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Stranger in a strange land