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SJM2018

Member Since: 06 Jul 2018
Location: Bristol
Posts: 296

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

9th Feb 2024 1:06pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5707

2006 Defender 110 Td5 USW Zermatt Silver

Possibly water on one of the switches or dodgy bonnet switch?

9th Feb 2024 4:04pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17386

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.

9th Feb 2024 4:54pm

Cragster69

Member Since: 15 Jun 2021
Location: Scotland
Posts: 193

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

9th Feb 2024 5:34pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20376

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. $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪

9th Feb 2024 8:55pm

SJM2018

Member Since: 06 Jul 2018
Location: Bristol
Posts: 296

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

2nd Apr 2024 8:58am

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