Berlingo 2011 Horn not working - relay ?

[TonyLunna]

I have a 2011 (built late 2011) Berlingo 1.6 HDi XTR and the horn does not work.
The horn has been replaced. The horn fuse (and all the fuses) in the fuse box under the bonnet test ok. When the horn button (air bag assembly) on the steering wheel is pressed there is a click from the relay in the fuse box both with the ignition on and off.
Is it possible to test the horn relay and if necessary replace it ?
Any suggestions/advice gratefully received.
Tony.

[GiveMeABreak]

I'll need a VIN to see exactly what model this is, but it mat be the multiplexed wiring behind the airbag module that is chafing or a bad connection there.

[TonyLunna]

Hello Marc,
The VIN is VF7**************[VIN obfuscated, can be read by forum staff]
Tony

[GiveMeABreak]

Hi Tony, ok, so you can check fuse F12 in the engine fuse box which supplies the relay, although if it's clicking then I expect it is fine to be honest.

click images to zoom

The horn has a 2 pin white connector as shown in diagram A (2521), part of harness 10PR - and the specific earthing point is MC10 as shown in the second diagram.

[van ordinaire]

Simplest test for a relay is by substitution.

[GiveMeABreak]

Not in these Mr Ordinaire!

The relays are contained in the engine fuse box module - non user serviceable

[TonyLunna]

The horn is working again The two pin connector on the horn was the culprit. I pulled the plug off the horn and plugged it back together again several times and seemingly that cleaned up the contacts enough. I also used a couple of cable ties to help hold the plug and socket tight together.
Hopefully that should be ok for the foreseeable future, but it's quite a poor quality connector so I'll see how it goes.

[TonyLunna]

Marc, thank you for those diagrams, they were very helpful.
Tony.

[GiveMeABreak]

No problem, it had to be electrical really, so probably a loose connection at the plug.

[white exec]

Down-front electrical connections can have a rough time - weather, road spray, engine bay heat, etc.
Use some contact cleaner (or WD40 if that's all available) and a bit of repeated re-plugging (as you did) to clean the contacts up. Glad the French Horn section is working again!

[van ordinaire]

Not in these Mr Ordinaire!

The relays are contained in the engine fuse box module - non user serviceable

Had no idea they'd gone as far as making relays complicated - but, of course, I shouldn't be surprised.

[westfielder]

I was going around in circles
Used the pics here

Checked the fuse
Loosened, moved around the earth point and retightened
Accessed the horn through N/S wheel arch
13mm ratchet ring to unto the bolt
WD40 and reseated the connections a load of times
Tried the horn directly to battery (worked fine)

In the end had my son hold the horn button on steering wheel WHILE I disconnected and reconnected the horn - it blipped.
If the connector is pushed all the way home it fails, if almost all the way it's fine. I put a piece of plastic in the connector and then pushed tight (but not clicked) and wapped in insulating tape

Seems to work fine now

Hope this may help others

Nick

[RoadRunner24]

Hi guys, I'm having a similar issue with my horn. 2015 Berlingo van It was intermittently working but now has stopped completely. Should there be a live feed to the horn? I've checked all the fuses and read somewhere that there should be a live at the horn and it earth's through the steering wheel when pushed?

[Peter.N.]

I'm not sure about the Berlingo bot others I have had were operated via the ECU.

Peter

[wheeler]

Hi guys, I'm having a similar issue with my horn. 2015 Berlingo van It was intermittently working but now has stopped completely. Should there be a live feed to the horn? I've checked all the fuses and read somewhere that there should be a live at the horn and it earth's through the steering wheel when pushed?

That's not quite correct, there is no direct connection to the horn & the steering wheel. a signal is sent down the CAN when the switch is pressed, this passed through he BSI then onto the under bonnet fuse box, this then triggers a relay to operate the horn.
Are you getting a live feed at the horn unit?