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Wism

Member Since: 27 Jun 2016
Location: Surrey, UK
Posts: 21

Horn blows when activating alarm

Hi all,

Bit of a strange one here but all of a sudden me vehicle has developed this issue where every time I activate the alarm (press the lock button on the fob) my horn/ hooter will blow twice. It's not done this before. It normally just locks all the doors and the indicators flash, no sound. I have also noticed that the drivers door sometimes will not close properly. Not sure if this can be the problem but even when I make sure the door is closed the issue still persists. I have even tried disconnecting the door switch then activated the alarm and the horn still blows so is the drivers door the actual problem then?
Anyone else had this issue? What else can I check?

2003 td5 90 csw

27th Jul 2016 5:40pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

The horn blows to tell you a door or bonnet isn't closed properly so one of the pin switches on any of the doors or bonnet may be corroded or unplugged and not registering being closed Ray
My build thread
http://www.defender2.net/forum/topic17615.html

27th Jul 2016 5:50pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 898

2000 Defender 110 Td5 XS CSW Epsom Green

Yup agree, check all your door switches and bonnet switch. 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

27th Jul 2016 9:08pm

Wism

Member Since: 27 Jun 2016
Location: Surrey, UK
Posts: 21

Many thanks,

Will look at the bonnet switch

27th Jul 2016 9:19pm

Leaky 110

Member Since: 12 Jul 2016
Location: Glasgow
Posts: 62

2007 Defender 110 Puma 2.4 XS CSW Zermatt Silver

Yep, a mislock. I've got the exact same issue with my puma, I've already checked all of the door switches and bonnet switch with no joy. Very frustrating, as the alarm has a mind of its own.

When I bought the car the previous owner had bypassed the horn rather than sort the fault! I'm guessing it might be the Lucas 10as alarm module, as the interior lights go haywire at the same time.

If all else fails, a quick diagnostic can show the alarm event history. From reading other threads about this, dirty switch contacts can be a really common culprit.

Let us know how you get on!

27th Jul 2016 9:34pm

Wism

Member Since: 27 Jun 2016
Location: Surrey, UK
Posts: 21

I'm not sure what I have done but it all appears to be working fine again. I just fiddled around with the door lock and fingers crossed the door closes fine and the alarm works fine. Thanks all

10th Aug 2016 10:35pm

agentmulder

Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

I had some intermittent issues with mine also, took the switches out and gave em a good clean and made sure the seals were sitting right, no problems for loooong time since.

They're pretty cheap as spares too, as a matter of fact I never got round to installing new ones ... Solved the bowel problem, working on the consonants...

11th Aug 2016 1:53am

TechnoTurkey

Member Since: 25 Jul 2016
Location: Worcestershire
Posts: 88

2005 Defender 110 Td5 CSW Zambezi Silver

Mine did this after I adjusted the passenger door so it shut tighter, I slackened it off a bit and then it was fine again.

11th Aug 2016 12:42pm

Ayrshirelandy

Member Since: 28 Mar 2015
Location: Ayrshire
Posts: 140

All too familiar. I had it with my Disco and it was the bonnet switch and the Puma does it if the door/bonnet not closed properly. It can seem annoying, but a good reminder that the door / bonnet isn't closed properly! 2015 Defender 110 XS Utility Santorini Black, sawtooth alloys, steps and so much more...........

11th Aug 2016 1:39pm

Leaky 110

Member Since: 12 Jul 2016
Location: Glasgow
Posts: 62

Nuke the car from orbit, it's the only way to be sure.

(Still haven't isolated the fault, 2 months after it started)

11th Aug 2016 1:42pm

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