C3 - Horn Sounds While Driving

[Guest Pepsi Cola]

Hi, just wondering if anyone else had this problem or has ANY ideea how to fix it?

 

Whilst driving (any speed) the horn starts to sound. I dont even go close to touching the horn, it just starts. There is nothing that i can do to stop it - only power off the engine and hope it doesnt do it again. Some days its ok doesnt happen once, other days it happens several times.

 

It is driving me absolutely mad, imagine being stuck at traffic lights with horn on full blast, people giving you bad looks its bloody embarrassing.

 

Thanks

[paul.h]

As a temporary measure you could pull the connector off the horn or remove its fuse (maybe fuse 13 in the fusebox under the bonnet). Does the horn work normally at all times ?

[Guest Pepsi Cola]

Thank you for the reply! Yes the horn works normally at all times.

I will try removing the fuse but then again I do need a functional horn :(

[paul.h]

Next thoughts are then a fault with the steering wheel switch such as broken springs so only a light push on the steering wheel works the horn or possibly a relay fault (may be located in the under bonnet fuse box but I am not sure). Pushing the switch gives a signal to the BSI which then causes a relay to be pulled in, the other side of which takes a supply from the battery through the fuse and to the horn. I can not see a wiring fault causing it since this is only likely to earth the positive supply rather than completing a circuit.

 

Iannez who contributes a lot to this site is a Citroen technician and may be able to help.