Hi Guys,

Got home from work this evening and now whenever I lock the car, the alarm starts going off within a few minutes.

I'm not sure if I'm doing the right thing, but I looked at live values -> complete list -> BCM and all the last 8 triggers just state "Volumetric sen"

Does that suggest a fault with the sensor itself? Any idea how to stop it triggering? I'm only single clicking the fob so it shouldn't even be activating the motion sensors.

I need to work out how I can lock it tonight! without annoying the neighbours! 2010 4.4 TDV8 Vogue SE

Probably not much help, but have a look in the setup menu…

Ah, missed that when I was perusing the manual.

Will give it a go. Thanks.

It's that or the alarm fuse! 2010 4.4 TDV8 Vogue SE

Well that didn't work. Will try the fuse next.

Looks like fuse 36 is the battery backed sounder. Fingers crossed...

Anyone able to confirm that the IID results imply a faulty volumetric sensor module? And what the part number might be? 2010 4.4 TDV8 Vogue SE

I wrote with exactly this fault on here this morning. It's fuse 43 bottom row 12th fuse from the left in the glovebox fuse box. Ignore the blank/empty fuse spaces. Removing 43 killed my alarm. HTH. Rehab is for quitters!!!

RR 2007 3.6 TDV8 Java Black
RR 2007 3.6 TDV8 Zermatt silver
RR 2000 P38 4.6 Met red
Mercedes 300TE 4-Matic
Nissan 300Z
Citroen XM 2.5TD X 6
Bentley Continental R
Hydrocon Highlander
Hydrocon Hamilton
Hydrocon Huntly
The restoration of the last three will account for my time during retirement!

Departed
LR 1992 110 2.5TD
RR 2000 Holland & Holland 4.6 LPG
RR 4.2 Supercharged with LPG, Vogue SE 2007 Buckingham Blue
RR 2002 4.4 V8 Zambesi Silver

Hi. Saw your post but didn't want to hijack it.

The face-lifts seem to have a different fuse. It's 36 on mine. At least it hasn't gone off for a couple of hours!

Been chatting to Patrick at Gap but it's a bit inconclusive. Apparently the triggers are an untested feature.

It sounds like it might be a faulty motion sensor looking at the trigger, but it still went off with them disabled so I'm wondering if it might be a failing battery in the siren itself - had this on my p38 when the battery back up died. 2010 4.4 TDV8 Vogue SE

Thanks. I hadn't realised the facelifts had different fuse boxes but then it's LR. Why make it easy?
Obviously I was concerned you'd got the wrong fuse but tonight I'm better informed. 😳 Rehab is for quitters!!!

RR 2007 3.6 TDV8 Java Black
RR 2007 3.6 TDV8 Zermatt silver
RR 2000 P38 4.6 Met red
Mercedes 300TE 4-Matic
Nissan 300Z
Citroen XM 2.5TD X 6
Bentley Continental R
Hydrocon Highlander
Hydrocon Hamilton
Hydrocon Huntly
The restoration of the last three will account for my time during retirement!

Departed
LR 1992 110 2.5TD
RR 2000 Holland & Holland 4.6 LPG
RR 4.2 Supercharged with LPG, Vogue SE 2007 Buckingham Blue
RR 2002 4.4 V8 Zambesi Silver

On my 2003, a second press of the lock button turns off volumetric sensing. I need this when camping as when my fridge turns on, its fans disturb the air and set off the alarm. Ron B. VK2OTC
2004 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

Last edited by p38arover on 21st Jun 2023 9:10am. Edited 1 time in total

On the later ones, it's the other way aroubd (ie 2nd press enables the sensors), but even with the sensors not active the alarm is still going off every few minutes. At least, it was until I pulled the fuse.

I'm starting to wonder if the iid tool trigger events might be a red herring as there doesn't seem to be a time stamp on them. They could be historical events which is leading me back to the battery backed siren again.

Anyone ever changed the battery in one? I used to have a link to a thread for a p38 procedure, but that's long gone. 2010 4.4 TDV8 Vogue SE

^^ I would prefer that method. Ron B. VK2OTC
2004 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

kooky_guy wrote:

On the later ones, it's the other way aroubd (ie 2nd press enables the sensors), but even with the sensors not active the alarm is still going off every few minutes. At least, it was until I pulled the fuse.

I had the issue of a random alarm sounding with my 2012 last year. I even once had it wailing when the car was actually being driven! Like you, I eventually resorted to pulling the fuse (36) and the problem was solved.

However, I later discovered that:

1. Locking the car with a door ajar didn't give any warning. Unless you watched the car when you pressed the fob to lock it, you could easily walk away with the car left open. The 'chirp' which would normally signal a non-locking event (door ajar) works off the alarm sounder.

2. I could no longer trickle charge the battery from the (white) towbar electrics plug. It appears that as well as the alarm sounder, this fuse also interrupts the main 12v line to the white towplug.

Recently, I've reinserted the fuse (36) and the alarm hasn't gone off....... yet.

I do wonder if a failing back-up battery was the cause of all the issues. Hopefully, it's totally dead now! I bet I get woken in the middle of the night now after writing this......  The older I get, the more I realise that people confuse wrinkles for wisdom

Interesting.

I've ordered a 2nd hand sounder - can't seem to find a new one.

I'll see if that makes a difference- seems to be such a common unit that you can even buy batteries for it.

If the new one solves the problem, I'll try changing the battery in the original and refit. 2010 4.4 TDV8 Vogue SE

My internal sensor was repeatedly causing the alarm to go off. Eventually removed the roof housing that contains the sensor and found a very large spider wandering around in it. Put the spider out to play elsewhere, reassembled the housing and never had a problem since. Might have been coincidence but….

I did think of that but it still goes off every few minutes with the sensors disabled.

I did give it a good blow though to see if anything appeared! 2010 4.4 TDV8 Vogue SE