My 2014 sdv8 has started sounding the alarm when I lock it with the fob. Both fobs do it. I get two beeps and sometimes the wing mirrors fold, sometimes not. The alarm triggers around 15 - 30 seconds after instigating the lock. I can stop the alarm by pressing the lock button again. All doors are locking.

Now looking at the problem the car locks with no alarm when using the door handle button ie keyless locking. I have a “last alarm” for the rear left door showing in the service menu.This door locks correctly, the soft close works and the light on the door handle illuminates when locking.

All this seems to have occurred after trying to switch off keyless entry. I tried to set this up using the recognised process on the fob, but it failed to work, I just got two flashes of the dash indicator lights.

Before I start swapping the rear door lock does anyone have any thoughts as to what the problem might be.

I think this is the door latch failing. A common fault and similar to the symptoms I had. The door would not lock with fob - so alarm would sound, mirrors would fold and I’d get the chirps to say “door open”. I used to lock with fob, (alarm sounded), unlock with fob, then re-lock with keyless push on handle on dodgy door in question and that worked until I could get the latch changed.
Compounded in my case as I had two latches fail within weeks of each other, so “last alarm trigger” was showing different doors!

Only used it for a couple of weeks, as wasn’t comfortable using keyless to lock car when I wasn’t at home or work.
I guess a final check would be bonnet switch bracket…but I’d go for the door latch as a 99% certainty. If you have Gap tool, it’ll confirm latch failure. L460 460e PHEV AB. Belgravia green.
Previous toys:
L405 2017 TDV6 AB
4.4 TDV8 Westminster. Santorini Black
1976 Lightweight
4.0l P38
2 Disco 3s
Jaguar XJ6 (X350)
Jaguar XJ8 (X308)
Jaguar XK
Jaguar XK8. Confirmed JLR nut.

I’ll check the bonnet as I have been under there recently so may be an issue. What’s puzzling me is the reported faulty door is locking perfectly. I understand the latch has a micro switch which tells the car it’s locked so possibly that has failed.

Yeah, I think it’s the microswitch. On my 2017, the app would alert me and record that the car was unlocked, even though all doors were locked with keyless method. L460 460e PHEV AB. Belgravia green.
Previous toys:
L405 2017 TDV6 AB
4.4 TDV8 Westminster. Santorini Black
1976 Lightweight
4.0l P38
2 Disco 3s
Jaguar XJ6 (X350)
Jaguar XJ8 (X308)
Jaguar XK
Jaguar XK8. Confirmed JLR nut.

So I’ve found a way to repair the latch without removing it.

I opened the door and used a screwdriver shaft to trigger the latch ( in the way it would operate if the door was closed). This exposed the inner workings of the latch ( towards the bottom of the car).I then sprayed a good amount of very light oil ( chain oil) into the latch. The latch was then operated by pulling the door handle. This process was repeated several times.

The latch then locked as before but this time it didn’t trigger the alarm so my hope is that something has freed up in the latch.

Well worth trying if anyone else has the same problem.

Top result, well done! Worthy of a celebratory beer. 🍺 L460 460e PHEV AB. Belgravia green.
Previous toys:
L405 2017 TDV6 AB
4.4 TDV8 Westminster. Santorini Black
1976 Lightweight
4.0l P38
2 Disco 3s
Jaguar XJ6 (X350)
Jaguar XJ8 (X308)
Jaguar XK
Jaguar XK8. Confirmed JLR nut.

I have a 2018 L405, double chirp, and alarm goes off. The alarm indicates its the left door unlocked. I have replaced the actuator and mechanism is working.

Only thing that stands out, is that the door lock is illuminating, but that amber dash on top is NOT unlike the other 3 doors.

I replaced actuator, had a mechanic take the door apart second time and nothing could be seen, now dropped it off at my mechanic who is more electronics focused to have a look.

Ask me anything maybe we can solve this together