A150 horn not working

[Nick64]

Fuse looks good. Does it use a relay? Any ideas on location etc.
Thanks All

 

[EmilysDad]

Have you tested the horn itself i.e. put 12 volts across it

 

[Nick64]

Have you tested the horn itself i.e. put 12 volts across it

Not yet. Raining at the moment. Will look at it later.
Is it visible inside the engine bay?
Also what’s the resistance of it?

 

[EmilysDad]

Not yet. Raining at the moment. Will look at it later.
Is it visible inside the engine bay?
Also what’s the resistance of it?

Sorry, no idea where it is .... wheel arch perhaps. But when ever a car horn has failed the easiest check is whether the horn itself is at fault or the wiring to it.
No need for a resistance check, just apply 12 volts dircectly across the terminals .... doesn't matter about polarity.

 

[Nick64]

Sorry, no idea where it is .... wheel arch perhaps. But when ever a car horn has failed the easiest check is whether the horn itself is at fault or the wiring to it.
No need for a resistance check, just apply 12 volts dircectly across the terminals .... doesn't matter about polarity.

Ok. Will report back

 

[mattkh]

....Does it use a relay?Thanks All

Yes, they all do because of the large current the horns use.

 

[Nick64]

Yes, they all do because of the large current the horns use.

That would be on the fuse board layout?

 

[mattkh]

Should be.
And in terms of checking the relay, you can just rely on hearing the 'click' when pressing the horn button.
It is most likely to be the horn because of the atmospheric conditions of where they are located.

 

[Nick64]

Thanks

 

[ZZZZ]

Is it visible inside the engine bay?

Yes, just on top of the radiator, right behind the Mercedes star - two of them.

 

[Nick64]

Relays or horns?
Won’t see the car until Saturday now.

 

[ZZZZ]

Relays or horns?
Won’t see the car until Saturday now.

Horns. Not sure about relays - bought a full kit to replace the standard ones, but am waiting for the rain to stop, before I get to fit them ... so could be a while - like next decade or so

 

[Nick64]

I am the proud owner of a girlfriend and as such she does not see rain.

 

[mioba]

I am the proud owner of a girlfriend and as such she does not see rain.

She gives you a horn right