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Mudlark46



Member Since: 27 Mar 2016
Location: Yorkshire
Posts: 8

England 2005 Defender 110 Td5 XS CSW Corris Grey
2005 110 TD5 alarm keeps going off randomly
2005 110 TD5 alarm keeps going off randomly,, the doors remain locked, the alarm goes off and stops after 20/30 seconds. I have put tape over the sensor above the drivers door, possibly solved it for a while but it's so random it's hard to tell. Keeps waking the neighbours up. Any ideas
Post #1052300 20th Nov 2024 1:18pm
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Jerry



Member Since: 13 Nov 2015
Location: Cardiff
Posts: 199

2015 Defender 110 Puma 2.2 Adventure Phoenix Orange
could be something simple like condensation, spiders or moth....worth looking at before you get a garage to check it at great expense. For condensation, silica gel works well (see if theres a correlation with really cold & damp weather outside + triggered at night). If insects - spray. (my neighbours merc alarm kept going of at random in the nights - he eventually found a dead moth on the back seat and no more alarm triggers). good luck.
Post #1052304 20th Nov 2024 1:41pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17443

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The 10AS unit can be interrogated with a diagnostic tools such as Nanocom to see what (i.e., which switch or sensor) triggered the alarm. Generally this is the sensible first step in diagnosing the cause.
Post #1052307 20th Nov 2024 2:47pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5724

2006 Defender 110 Td5 USW Zermatt Silver
Bypass bonnet switch as a test. But I had similar once and was the drivers door central locking mechanism, only did it when cold.
Post #1052325 20th Nov 2024 6:07pm
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 940

Canada 2000 Defender 110 Td5 XS CSW Epsom Green
Very common issue is the bonnet switch up by the firewall. Bend the mounting bracket up about 1mm and see what happens

Good luck 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)
Post #1052548 22nd Nov 2024 6:55pm
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2173

2004 Defender 110 Td5 DCPU Epsom Green
I would unplug the volumetric sensor, that was the fault on mine for a while.

As suggested the bonnet switch.

It could also be any of the door switched randomly earthing out and the car thinking a doors opened when the alarms set. Also easy to check.

You can also lock the door with just the key, it will lock the doors but not arm the 10as Instagram @defender_ventures
Empire Tuning - Agent
Post #1052553 22nd Nov 2024 7:35pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20441

United Kingdom 
Check the battery voltage as well, it might be dropping below expected values. $W33T $0U7H3RN $UG4R
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Post #1052554 22nd Nov 2024 8:01pm
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