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Berlingo van horn fault.

Posted By sjparky 10/11/2009 9:05:30 AM
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sjparky
 Posted 10/11/2009 9:05:30 AM
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Hi

I am having a problem with my 2.0 HDI Berlingo van on a late 2003 plate.

When the ignition is turned on, the horn doesn't work, but if ignition turned off, it works.

I've been told that it could be a fault with the BSI, but the wiring diagram I've got doesn't show it going through this, just a few relays & the switch on the steering wheel.

Any help is appreciated.

Angus
 Posted 10/11/2009 12:38:58 PM
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sjparky

Welcome to the forum.

The diagram that I've got for an '03 Berlingo shows a simple system too - not even a relay.  Odd; as I'd have thought that it would have been connected through the Comms 2000 column module/BSI too?

However; based on the diagram, the feed leaves permanently-live[?] dash fuse 17 through terminal C17 [of a black 34-pin plug] and proceeds down a cable marked B17 to pin 3A on the white 5-pin steering-wheel switch connector. 

Once that switch is closed, it travels back through pin 1A of that white connector, down cable coded 250 to the horn, which is earthed by cable M250/MC4 to an earth-point on the L/H front wing.

To find out what's wrong; turn on the ignition and test that circuit - I'd suggest starting at the horn's earth and working back.

.

sjparky
 Posted 10/11/2009 5:26:10 PM
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Thanks for replying Angus

What's got me really confused is that exactly the same fault occurred last year which was apparently fixed by my local Citroen dealer by replacing the comms unit.

This time however, they say its not the comms unit, but might be the BSI unit.

Maybe there is some info I'm missing, knowing that simple things seem to be made more complicated than they need be these days.

Do you know where the engine and passenger fuse boxes are, I've looked for them, and fuses F8, F17 with no look.

I'll start tracing back from the horn as you suggest.

Thanks again.

Angus
 Posted 10/11/2009 6:21:38 PM
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sj

The fuse box is in the lower dash - check your handbook for the exact fuse position.  Forget the engine box for now.

The steering wheel connector will be the white one on the Comms - it must just pass through it.

Might be worth checking that the brake light wiring isn't chafing on the steering column - I can't see why having the ignition on causes this fault.  Chafing brake wiring livens the column and frys Comms units - if they don't go wrong all by themselves....

As a first test; is either, or both, of the terminals on the horn live, key-on and horn pressed?

.

cartech
 Posted 10/11/2009 7:06:26 PM
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Just a thought:
This could be a bad earth as follows: If the earth is shared with another component which is only live with ignition on, it might be using the component as an earth route, and when the ignition is on it kills the earth.


If I understood women as well as I understand cars, I'd be the envy of every man.
CYRIL
 Posted 10/12/2009 4:05:20 AM
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As Angus said it is through the BSI.

You really need a a scanner that you can do actuations on this way you can work out what it is .

if the bsi picks up the command then its The BSI or forward of it, if it has not picked the command up then its before the BSI such as the horn push or the comms unit

not being silly now but unless you go this way you might as well #### in a bucket  

Regards Cyril

sjparky
 Posted 10/12/2009 4:00:26 PM
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Thanks for the replies.

I'm going to let the Citroen dealer have a look on Friday.

Hopefully they'll find the problem quickly.

If not, out comes the multimeter on Saturday, although I'm not sure sure I'll be able to do more than them.... hope its going to be dry...

I'll post the cause when/if its found.

sjparky

sjparky
 Posted 10/17/2009 6:36:48 AM
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Just to let you know, the horn fault was down to a few bad earths.

All sorted now.


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