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petercassidy

Member Since: 19 Nov 2019
Location: Eastbourne
Posts: 24

2007 Defender 110 Puma 2.4 XS CSW Bonatti Grey

Horn not working...2007 Puma

MOT on Monday and just found out horn not working.....

I've so far eliminated...

Fuse all good

Switch on stalk (swapped it out with another one)

Horn ( leaving the drivers door open and activating the remote LR fob causes horn to sound as a warning) therefore horn works.

So that leaves a wire break somewhere in the loom.

Where are the obvious wire loom failures or specific points that would still allow the horn to work in conjunction with the LR alarm?

I might just run a wire as a bypass to the loom from the stalk switch to horn as a temp solution.

Thoughts?

6th Aug 2020 7:39pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8020

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Key fob makes horn sound or back up sounder? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

6th Aug 2020 10:12pm

petercassidy

Member Since: 19 Nov 2019
Location: Eastbourne
Posts: 24

I'm not sure. It's the factory fitted alarm. If a door is open when you click to lock the doors the doors lock but the horn sounds too. Is this a different horn to the normal steering wheel stalk operated horn then?

6th Aug 2020 10:19pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3414

2012 Defender 90 Puma 2.2 CSW Santorini Black

Dont have 2007 electrical diagrams, but on 2012 electrical diagram I see the horns are connected in a few different ways, I think it depends if you have the anti theft system or not.

Since you mention that you have factory backup alarm, then can you check if you have Relay Sounder Alarm (R200). Seems to me that relay and the Alarm Ecu are used to trigger the horns.

Have you also checked if you have 12V before the horn switch all the time, and 12V after the horn switch when the switch is pressed? 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

7th Aug 2020 5:52am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17362

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

If you don't have a battery backed alarm sounder you have a separate horn for the alarm, and in all the circumstances you describe this is what you're hearing, not the vehicle horns.

There is one vehicle horn adjacent to each headlight and it is likely that both have packed in. To access them remove the headlights (an easy screwdriver-only job). The horns have odd connectors on them but if you're not averse to changing the connectors there are plenty of good aftermarket horns from manufacturers such as Fiamm which can be fitted which are better value than genuine parts.

7th Aug 2020 6:44am

petercassidy

Member Since: 19 Nov 2019
Location: Eastbourne
Posts: 24

Ah, that's actually encouraging to know that a different horn is used for the alarm.
I'll have a look at the horn behind a headlamp then. Does one horn feed on to the other? Which one is the first horn in the series?

7th Aug 2020 7:31am

G4UJS

Member Since: 20 Jan 2019
Location: Shropshire
Posts: 226

2008 Defender 110 Puma 2.4 CSW Zermatt Silver

both of my horns packed up at the same time.... I bought the replacements from Bearmach with the correct connectors for less than £15 for the pair.

easy fit

regards

Rob

7th Aug 2020 8:10am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17362

petercassidy wrote:
Ah, that's actually encouraging to know that a different horn is used for the alarm.
I'll have a look at the horn behind a headlamp then. Does one horn feed on to the other? Which one is the first horn in the series?

The horns are connected in parallel, so if one fails the other should still work. It is likely that both have failed, but check the wiring with a meter or test lamp before forking out for new horns.

Usually you don't notice when the first one fails because they not exactly loud even when working, but you do notice when the second fails!

Last edited by blackwolf on 7th Aug 2020 8:20am. Edited 1 time in total

7th Aug 2020 8:19am

petercassidy

Member Since: 19 Nov 2019
Location: Eastbourne
Posts: 24

That's weird that they both packed up same time??

7th Aug 2020 8:20am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17362

Posts crossed! See my update above.

7th Aug 2020 8:20am

petercassidy

Member Since: 19 Nov 2019
Location: Eastbourne
Posts: 24

Ok, so this afternoon I removed one horn and attached it to a battery...nothing.
So took a horn out of another vehicle and hey presto, working!

9th Aug 2020 9:03pm

petercassidy

Member Since: 19 Nov 2019
Location: Eastbourne
Posts: 24

Got 2 OEM replacements today and fitted them. All good now.

18th Aug 2020 9:01pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17362

18th Aug 2020 9:57pm

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