...Thanks for that; somehow I can't see the Skoda range doing well in Egypt, India or Italy if they can only sound the horn for one second!

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I think the idea is to stop this happening. It sounds like something the Swiss would want - they have no tolerance of 'unnecessary' noise.

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I have a pair of Ring two-tone horns and associated relay from a car that I no longer have. Can you tell me whether this would work on a Fabia vRS and if the relay would be likely to include the appropriate diode? I have attached a .PDF of the instructions that came with the kit.

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If the relay doesn't show a diode symbol on it, just buy one that you know has one in.

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ps - why would the CECM want to sound the horn independently of the horn push? Just for the theft alarm?

You are thinking about this as a dedicated function. In theory, you could program the box to flash the reversing lights when the horn push was pressed. For the 'anti-lean' function, the horn output goes high when the horn push is pressed but goes low after 1s. The output is not just following the input.

On the monte the horn is located behind the nearside DRL/fog light housing.

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Once again,my thanks for your advice, if I do end up using the twin-tone horns I will buy a suitable relay although the one I have did come with the kit.

 

It sounds like something the Swiss would want - they have no tolerance of 'unnecessary' noise.

 

That would explain why the Swiss don't seem to do too well in the Eurovision Song Contest

Hey guys! Right, so I took a completely different approach to it!

I wanted to keep my current horn and have the second horn as more of a novelty horn! Instead of wiring it the old horn circuit I simply never touched it! I went out and bought some 27amp wire, run it through the hole on the drivers side (the one to change the bonnet pop to that side) put a switch in the car and just made a simple circuit! Switch to compressor, compressor to battery, batter to switch! Put an inline fuse in but wasn't to sure what amp it was drawing and never had my multi meter handy! Dropped a 15amp In and it got annihalated! Dropped a 25in and it's fine!

Horn sounds beautiful. One high one low and together sound beefy!

On 26/03/2014 at 21:32, rwbaldwin said:

The wire to the treble horn is only 1mm. This is why cars with both a treble and bass horn have a separate wire for each horn all the way back to the CECM where they are connected together.

Most auto electricians would see the small wire and add a relay, but back emf from the relay can apparently damage some CECMs hence the diode across the relay coil. I've drawn out the circuit required for Darren and put it here http://www.s-tech.demon.co.uk/horn.jpg

I have just seen your circuit diagram, what value would the diode be?

As it says in the text "back EMF from the relay can damage some CECMs, hence the diode"

 

In other words, it stops the relay killing your control module as it switches. Don't ignore this.