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Horn Wiring Diagram
#1
Hello,

I have a 2005 Berlingo HDi and the horn does not work.I recently bought the van second hand and the previous owners were electricians!

They have done a lot of additional wiring and rewiring.

Anyhow they have done some rewiring with the horn for some reason, There is no power to the horn and a wire is hanging loose,

I need the wiring diagram for the horn so I can figure it out.

Can anyone assist please?

Regards

Barry
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#2
(17-02-2018, 04:06 PM)barrymurphy Wrote:  Hello,

I have a 2005 Berlingo HDi and the horn does not work.I recently bought the van second hand and the previous owners were electricians!

They have done a lot of additional wiring and rewiring.

Anyhow they have done some rewiring with the horn for some reason, There is no power to the horn and a wire is hanging loose,

I need the wiring diagram for the horn so I can figure it out.

Can anyone assist please?

Regards

Barry

Can anyone assist?

thanks

Barry
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#3
my scanner is not working at the moment so I'll try to describe it.

From Haynes manual

Battery to engine fuse box (fuse 8) to passenger fuse box (fuse 17) to steering wheel switches(horn button) to horn to earth.

The wire colours don't mean a lot as they are not consistent. The numbers on the wires are and on the components are.

From C1 at the engine fuse box (wire BMF8, 46Nr) to C1 at the passenger fuse box.(may be green 1Gr)  From C17 (fuse 17 @15amp)  (wire B17, 34Nr) to 3A at steering wheel switch . From 1A ( wire 250, 5Ba) on switch to Horn then to earth.

With a multimeter you should be able to trace  back from horn to switch easily.

There have been a lot of posts about the earthing of the steering column to get the horn to work which may suggest that the horn works by earthing it. Your problems are more likely to be between the switch and the horn.
if the loose wire is an earth then maybe its  just fallen off.

There are lots of variations of the wiring on the different models so all this may be not be right for your model.
2006 2.0Hdi Berlingo
[-] The following 1 user says Thank You to brodfather11 for this post:
  • barrymurphy
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#4
(20-02-2018, 07:49 AM)brodfather11 Wrote:  my scanner is not working at the moment so I'll try to describe it.

From Haynes manual

Battery to engine fuse box (fuse 8) to passenger fuse box (fuse 17) to steering wheel switches(horn button) to horn to earth.

The wire colours don't mean a lot as they are not consistent. The numbers on the wires are and on the components are.

From C1 at the engine fuse box (wire BMF8, 46Nr) to C1 at the passenger fuse box.(may be green 1Gr)  From C17 (fuse 17 @15amp)  (wire B17, 34Nr) to 3A at steering wheel switch . From 1A ( wire 250, 5Ba) on switch to Horn then to earth.

With a multimeter you should be able to trace  back from horn to switch easily.

There have been a lot of posts about the earthing of the steering column to get the horn to work which may suggest that the horn works by earthing it. Your problems are more likely to be between the switch and the horn.
if the loose wire is an earth then maybe its  just fallen off.

There are lots of variations of the wiring on the different models so all this may be not be right for your model.

Thanks for this.

What confuses me is when people say switch. The "switch" you mention is where the four contacts on the airbag make contact with the wheel frame and I assume complete the circuit?

Also the wires behind the airbag seem all airbag related? there is a red wire going to the airbag and an earth going to the wheel frame but they come from a plastic connection that the airbag white leads plug into. So I assume all airbag related or is that same earth also for the horn?

thanks


Barry
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#5
Wait and I will check out the wiring behind my horn (06 model) this afternoon, just to make sure.
2006 2.0Hdi Berlingo
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#6
(20-02-2018, 12:06 PM)brodfather11 Wrote:  Wait and I will check out the wiring behind my horn (06 model) this afternoon, just to make sure.

When the air bag is out , at the top of the steering wheel is a plug coming through with three wires from it. The r/hand wire goes to the L/H horn button terminal. the left hand one goes to the air bag . the middle goes to a switch??? mounted at the side of the wheel and from that comes a black wire to earth and a red wire to the R/H horn terminal.
2006 2.0Hdi Berlingo
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