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SJM2018



Member Since: 06 Jul 2018
Location: Bristol
Posts: 296
United Kingdom 2011 Defender 90 Puma 2.4 XS CSW Aintree Green
Strange alarm fault
My alarm kept randomly going off last weekend and doing the double beep/honk when I'd locked it.

The double honk only happens if a door is open and all doors were closed.

I assumed the door "sensors" were faulty; so unscrewed each of them, gave the contacts a scratch with some wet and dry, a blast of contact cleaner and resassembled.

I haven't had the fault since (touch wood), but I don't really understand why this fixed the issue.

It appears the sensor works by breaking the circuit when the door is closed and when I first checked the sensors, they were being depressed by each of their respective doors - so you would assume all circuits were broken.

I don't really know how cleaning the contacts has fixed the issue.... but thought I'd share in case anyone else has something similar happen. 2011 CSW XS 90
Post #1024091 9th Feb 2024 2:06pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5424
2006 Defender 110 Td5 USW Zermatt Silver
Possibly water on one of the switches or dodgy bonnet switch?
Post #1024110 9th Feb 2024 5:04pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16892
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
If you have a suitable diagnostic tool you can interrogate the alarm ECU and see what triggered it. Saves a lot of time.
Post #1024114 9th Feb 2024 5:54pm
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Cragster69



Member Since: 15 Jun 2021
Location: Scotland
Posts: 166
Scotland 2007 Defender 110 Puma 2.4 CSW Cairns Blue
Any recommendations?

My basic OBDII scanner isn't really cutting it at the moment and I need to upgrade, something that can put Electronic Parking Brakes in Maintenance Mode would be a great help. Craig.

“Don't believe everything you read on the internet.” ― Abraham Lincoln

www.scotgrc.co.uk
Post #1024119 9th Feb 2024 6:34pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19604
United Kingdom 
It’s common for them to play up, they are relatively cheap to replace which is why I have any suspicions I just replace them.
The bonnet item is not as cheap though. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧
Post #1024145 9th Feb 2024 9:55pm
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SJM2018



Member Since: 06 Jul 2018
Location: Bristol
Posts: 296
United Kingdom 2011 Defender 90 Puma 2.4 XS CSW Aintree Green
Alas, the issue has reappeared.

The rubber sleeve on the bonnet switch is perished and the plunger is wonky.

Ordered a replacement (AMR2022) from John Craddocks eBay store £15 delivered (vs £46 if bought direct through their website).

Hopefully this sorts the issue. 2011 CSW XS 90
Post #1030176 2nd Apr 2024 9:58am
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