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Alarm activates repeatedly when vehicle locked

Old Nov 26, 2025 | 09:40 AM
  #1  
Jake S's Avatar
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Default Alarm activates repeatedly when vehicle locked

2021 Defender 110 S

When locked, the car alarm activates after a few minutes and will keep activating until unlocked using key fob or disabling the alarm through the app. Car shows last alarm triggered by the driver's door.

I am thinking there may be an issue with the electronics in the door lock actuator or possibly with the door handle.

Has anyone encountered this issue, and if so how have you remedied?

Thank you
 
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Old Feb 16, 2026 | 05:05 PM
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Originally Posted by Jake S
2021 Defender 110 S

When locked, the car alarm activates after a few minutes and will keep activating until unlocked using key fob or disabling the alarm through the app. Car shows last alarm triggered by the driver's door.

I am thinking there may be an issue with the electronics in the door lock actuator or possibly with the door handle.

Has anyone encountered this issue, and if so how have you remedied?

Thank you
Same issue. Driving me bonkers.
We and an LR mechanic (not a dealer) diagnosed the door lock actuator as well so I bought a used door and fitted it. NO luck. Took it back to the same mechanic and this time he said it must be the ignition sensor ring which he replaced with new.
It doesn't happen as frequently now but the problem still exists. You mentioned Disabling the Alarm through the app.
I assume you are meaning on the Gap tool? I can not find the ability on the tool.
 
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Old Feb 16, 2026 | 07:46 PM
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On the L663 that sounds like a door lock actuator. If the drivers door is giving the door open signal then it’s the latch. Nothing else it could be unless you have a bigger electrical system issue, which would be -- water under your floors from plugged drain tubes etc etc. Door handle doesn’t provide that function and alarm does not activate on these when the door handle is levered / button pressed (like on some older cars, I believe if someone tried the door handle, the alarm would sound).

Other guy - you are not talking about L663 Defender are you? The doesn’t have an ignition sensor ring unless your terminology is awry.
 
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Old Feb 16, 2026 | 11:05 PM
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[QUOTE=
Other guy - you are not talking about L663 Defender are you? The doesn’t have an ignition sensor ring unless your terminology is awry.[/QUOTE]
No, and probably my terminology is wrong. Mine is an L3 but I assume the same problems cross platforms. On mine there is a piece of the ignition switch that as I understand recognizes the key. It was replaced to no avail.
 
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Old Feb 17, 2026 | 06:46 AM
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Well,.. to take it a bit off topic here -- Completely different car w/ different systems. Some of the same principles apply but I have owned a few of the LR3/D3 platform and the ignition switch would have nothing to do with the alarm going off, sad to say you got bad advice. Odd they’d replace that.

On an LR3 it’s almost always the hood latch. . Same with RRS of that generation (2005-2013 Rovers). You’ve checked that? Or -- speaking of same principles -- water ingress into the splices in the harness in the door sills on passenger, sometimes drivers side from sunroof drain tubes. Causes corrosion which is not readily apparent without removing the sills and pulling up carpet and looking inside the actual wiring harness -- which causes all sorts of grief.
 
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