Horn MOT failure

[unomatt 10]

MOT last week, failed on the horn and brake hoses, not too bad I thought, will just be a fuse...it isn't a fuse. When I put the wires together I can hear clicking, does that sound like the horn itself has had it?

[Wayne2015 10]

My horn don't work coz the horn wires been mixed up with the fog wires! :eek:

 

(ie push horn on steering wheel fog comes on,

Press fog light button and horn comes on!)

[vw rule 19]

Hello there,

 

it could be a relay or bad earth,

a bad earth won't allow the relay to function correctly as it needs a good consistent flow of current,

which can cause the relay to buzz or click as the circuit is too weak.

There's two relays next to one another with the number 53 stamped on them,

I think the one on the right is for the horns,

the horn relay should be a 4 pin.

 

If you pull the horn relay out you should see it's got 4 connecting pins,

and each one has a number stamped under or next to each pin.

 

Pin 1 = power to relay (blue / brown wire) 12v

Pin 2 = power to the horns (brown / black wire) 12v here once the horn button is pressed.

Pin 3 = earth

Pin 4 = from horn button = (once the horn button is pressed it should complete the circuit and horns should sound)

 

All you need to have the horns working is power and an earth,

if one of these is missing then the horns won't work.

 

You could unplug the horns and try a fresh new live and earth purely to test them,

from a separate battery or use a power probe if you have one.

And if the horns work then you know the fault is with the wiring somewhere.

 

Also operate the horn button with one hand, while the other is on the horn relay,

as the clicking you're hearing might be coming from the relay ?

It's rare but relays can and do burn out.

 

Really you need a multimeter or test light or power probe to find the fault, well these can help anyway.

 

Any clues to where you think this clicking sound is coming from,

behind the dash or from the fuse box or from the engine bay ?

 

 

Hope this helps.

 

Si

[GreenRado 10]

Funny thing with mine. My horn works fine, but I pulled off the horn cover on the steering wheel to realign the steering wheel with the wheels. Anyway I noticed that one of the wires wasn't connected to the horn (I think it was the Earth?). Anyway I plugged it back in and then the horn stopped working. Unplugged it again and now it works again...

[unomatt 10]

Evening guys, thanks for the responses. The clicking sounds like it is coming from the fuse box area so could be a relay issue. I will whip it out tomorrow and see if it's all there using your guide, thanks! GreenRado- interesting, maybe I should play around with that too!