Having read all the threads on Alarms I have tried all the suggestions but my alarm keeps sounding on my 2012 TDV8, it usually goes at 9:00 in the evening and sometimes later. (just to annoy the Neighbours).
I have disconnected the bonnet switch and wd40 all the locks.
In theory the single lock should only set the perimeter alarm but when I check on the dash it says alarm set after single lock.
Disabling this doesn't seem to help as when you reopen the alarm is set gain. I have also vacuumed the roof sensor
Handbook says Alarm should be only triggered by door or boot opening, battery disconnect or Sounder disconnect.
I have rattled all the doors and boot with alarm set and it doesn't trigger and also tried locking with the other key.
I am running out of ideas of what to try

Any suggestions?

Roger L322 4,4 TDV8
Freelander 2 sold
Honda Transalp
Sunbeam S7 deluxe (in bits)
Sunbeam S8 (restoring)

To keep the neighbours happy you could also disconnect the sounder until you figure out the issue.

Taken any garden waste to the tip recently? I used to get escapee spiders/beetle that would set off the interior sensors. .
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

Where is the sounder, I thought it used the horns, I would like to disable inside sensors to help diagnose problem but cant see how to do it as they always seem to set themselves.

Roger L322 4,4 TDV8
Freelander 2 sold
Honda Transalp
Sunbeam S7 deluxe (in bits)
Sunbeam S8 (restoring)

Should be not far from the bonnet button in the gap between the main firewall and the inner firewall, RHS, near the wing. .
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

Thanks just waiting for it to go off, as a thought can I disable to internal cabin sensors by taping over vents in roof fitting, or if i unplug then will the car lock okay ?

Rog L322 4,4 TDV8
Freelander 2 sold
Honda Transalp
Sunbeam S7 deluxe (in bits)
Sunbeam S8 (restoring)

So no alarm last night, lets see if it lasts.
My Icarsoft seems to have logged a backdoor agar alarm so I had stripped back door and disconnected latch, lots of wd40 and re-assembled. I took ultrasonic sensor off and blew clean
Also rest BCU by touching battery leads together.

Not sure which is any made a difference

Lets see

Rog L322 4,4 TDV8
Freelander 2 sold
Honda Transalp
Sunbeam S7 deluxe (in bits)
Sunbeam S8 (restoring)