Evening all, I know that this topic has been covered before however I have just done a search and mine is behaving a bit differently to the others described on here. The alarm goes off for no apparent reason. It generally stops when I unlock the doors, apart from once where it kept sounding however I was able to start the car and drive it with the alarm going off (it is the electronic beep rather than the horn sounding). Only several lock/unlock cycles eventually stopped it. I have modified the bonnet switch with a bit of extra plastic and this seemed to work, however it was going off most of last night (so I was informed by a neighbour - I didn't hear a thing). I then disconnected the wire to the bonnet switch (albeit without closing the circuit) but it went off again. I have since locked the car with the partial arming (i.e. pressing the button twice)but it has still gone off. This is not happening all the time, and the only thing I can think of that seems to be consistent is that it appears to happen after I have washed the car. Could water be getting in to the fuses or some other part of the electrical system? If I use the paper clip method to close the bonnet switch circuit will it stop? I am going to try and get it sorted tomorrow but for the sake of neighbourly relations a temporary solution for tonight would be much appreciated! Thanks 1982 SIII 88â€� diesel
2007 Discovery 3 V8 S
All gone: 2007 Overfinch TDV8
2007 Supercharged
1991 Vogue SE 3.9 V8
2000 Defender 90 Td5

If its anything to do with the bonnet switch then just unplug it. I did with mine, it's not gone off mysteriously since. Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top

*Gone:L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

Isn't the beep when something inside the car sets it off, and the horn when something outside sets it off?

If so worth checking you haven't got anything "moving" in the car, or anything big and bulky. I had trouble with a couple of black bags of old clothes I was taking to the charity shop. Kept setting off the interior alarm. Eventually had to take them out. .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Had a new bonnet switch fitted to mine - quick job, no more problems 2005 L322 Vogue Gold gone
2006 L322 Vogue Black gone
2011 L322 Vogue Silver gone
2011 L322 Autobiography Black gone
2015 L405 Autobiography LWB Black gone
2019 L405 P400e Range Rover Autobiography LWB Eiger grey / black roof gone
2001 P38a 30th Anniversary Wimbledon Green gone
2019 L405 P525 Autobiography LWB British Racing Green

Thanks for the suggestions. Don't think it's the bonnet switch as it is disconnected. There is nothing moving inside the car either. A mystery! 1982 SIII 88â€� diesel
2007 Discovery 3 V8 S
All gone: 2007 Overfinch TDV8
2007 Supercharged
1991 Vogue SE 3.9 V8
2000 Defender 90 Td5

had a spider in mine set it off 2007 tdv8 se ,stornaway grey

The door latches contain the alarm microswitches, if they are getting wet? That might be your issue??? I would spray some WD40 in each and then open and close the doors a dozen or so times before finally slamming each door hard... Try that? And at least it it does not work! Your neighbour will not think your lazy!

Worse case scenario (check your ign key works your door lock) then open your bonnet, pull the bonnet pin switch up and lock the car. They disconnect the battery lead and close the bonnet

Thanks Craig, I will give that a go in the morning. 1982 SIII 88â€� diesel
2007 Discovery 3 V8 S
All gone: 2007 Overfinch TDV8
2007 Supercharged
1991 Vogue SE 3.9 V8
2000 Defender 90 Td5

Try locking it with a different key fob - we had a weird problem with ours where one fob would lock it OK, but the alarm would go off regularly - the other was fine - I since replaced the faulty fob & have had no issues since.

Thanks, will try that too! Craig, which bit of the door latches specifically need spraying with WD40? 1982 SIII 88â€� diesel
2007 Discovery 3 V8 S
All gone: 2007 Overfinch TDV8
2007 Supercharged
1991 Vogue SE 3.9 V8
2000 Defender 90 Td5

Its not scientific I’m afraid Ruffy i would spray in the latch plate striker hole liberally sir

If that doesn't sort it, there could be a broken wire(s) in the door loom, I'm not familiar with the door switch operation, as to whether they are switching to live or earth, if they switch to earth then a single wire could be causing the fault. Yesterday I couldn't spell Engineer... Today I are one!
Inventor of the 'Guide-o-Matic automatic wheel alignment tool'
Former long term L322 owner, Up/Down graded to a Classic Tractor!

does anyone know where the chirper is, as I had a few nightime false alarms, and wondered if I could tape over it, so its not quite so noisy. (2002 petrol)

RHS rear quarter from memory?????

Behind the RHF splash guard on later models

miggit wrote:

If that doesn't sort it, there could be a broken wire(s) in the door loom, I'm not familiar with the door switch operation, as to whether they are switching to live or earth, if they switch to earth then a single wire could be causing the fault.

They are usually switched to earth Miggit, that way when the car goes to sleep it does not affect battery life sir