Hi, did you ever get this sorted?
I have the same problem (horn not working on the button but does sound when trying to lock with a door open, and a non-standard radio recently fitted) but not sure how to proceed - not particularly clever and can’t make head not tail of the wiring diagram. If anyone can tell me which coloured wires on the radio loom to check and the fix, I would be really grateful. Cheers.
 
Hi, did you ever get this sorted?
I have the same problem (horn not working on the button but does sound when trying to lock with a door open, and a non-standard radio recently fitted) but not sure how to proceed - not particularly clever and can’t make head not tail of the wiring diagram. If anyone can tell me which coloured wires on the radio loom to check and the fix, I would be really grateful. Cheers.
Horn issues are normally due to the clock spring (rotary coupler) being faulty. They're NLA, so it's a second hand one only I'm afraid.

The way around it is to swap the wires for the horn over to the wires for the CC, unless of course you have CC fitted, in which case you need a replacement clock spring. ;)
 

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