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SteveK



Member Since: 21 Jan 2015
Location: Bromsgrove
Posts: 331
United Kingdom 2002 Defender 110 Td5 HT Rimini Red
Alarm False Triggers
Thursday morning the alarm on my 2002 TD5 110 went off at 06.25, which for me wasn't too bad as I was due to get up at 06.30 anyway! However, I don't think my neighbours were too pleased though!

I checked out my Defender (as soon as I was decently attired!) and all was well. From the looks of things it had just started raining and I think this caused some kind of pressure change that caused the volumetric sensor to trigger.

Anyway tonight is 18 degrees outside, clear and dry and the alarm has gone off twice already!


Where do I start?
Post #782481 21st Jul 2019 11:23pm
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Balvaig



Member Since: 19 Feb 2016
Location: Fife
Posts: 719
Scotland 2016 Defender 90 Puma 2.2 Landmark LE Corris Grey
Could be a fly or spider setting it off or a fault. I think that if you lock the car with the key you set the alarm but without the volumetric sensor. Locking with the fob sets the alarm and volumetric sensor.
This will establish if it is the sensor at fault, or insect setting it off.
Also worth pressing the bonnet switch a few times, as this can be sticky and set off the alarm.
A few things to be going on with.
Post #782504 22nd Jul 2019 7:59am
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5417
2006 Defender 110 Td5 USW Zermatt Silver
With alarm faults I always start with eith bypassing the bonnet sensor, or unplugging the internal sensor and seeing if any more false alarms happen. Often during rain it’s water getting onto the door switches, and a good spray with an oil can solve this, but now your getting dry false alarms try the first mentioned options. Does it always lock ok?
Post #782510 22nd Jul 2019 9:02am
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SteveK



Member Since: 21 Jan 2015
Location: Bromsgrove
Posts: 331
United Kingdom 2002 Defender 110 Td5 HT Rimini Red
I'm pretty sure the issue is with the volumetric sensor.

I changed the bonnet switch fairly recently and light to moderate pushes on the bonnet don't trigger the alarm.

Locking the car with the key ensured a good night's sleep - last evening the alarm went off a few times before I locked it with the key rather than the remote!

There are no flies in my car - the spiders have eaten them al!

Seriously though, is it just a matter of changing the volumetric sensor?
Post #782623 22nd Jul 2019 8:25pm
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784
United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
I would get it plugged into a nanocom. That will tell you what last triggered the alarm Thumbs Up 2002 90 Td5 Station Wagon
1990 Vogue SE
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Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
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Post #782644 22nd Jul 2019 9:20pm
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