u/Sir-Rapetta

Hi everyone,
I have a Land Rover Defender 110 TD5 and I’ve noticed a strange intermittent high-pitched noise coming from somewhere inside the cabin.
It doesn’t happen all the time. When it does, it’s a continuous high-pitched sound that lasts for a few seconds, something like “eeeeeeeeee…”, and then, just before stopping, the pitch drops noticeably (“eeeeee… eeeooow”).
We can’t pinpoint exactly where inside the cabin it’s coming from, probably from the front.
The strangest thing is that it doesn’t only happen while driving or with the engine running. On at least one occasion it happened while the Defender was parked, with the engine off and the key completely removed from the ignition for several minutes.
The vehicle has the original Land Rover alarm/immobiliser, but it also has a couple of aftermarket accessories:
Rear parking sensors
An aftermarket LCD/CarPlay head unit
There are no obvious warning lights or other symptoms that seem to occur at the same time as the noise.
Has anyone with a TD5 Defender experienced something similar?
I’m particularly interested in knowing whether there are any original Defender components, relays, alarm/immobiliser modules, buzzers, etc. that can remain powered after the key has been removed and could make this kind of high-pitched sound.
Any ideas on what I should check first would be greatly appreciated.
Thanks!

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After updating today to ios 26.5 the app crash when launched, i tried to update to the last eevee version but it still crash. I tried with older versions and the app start but it doesn’t let me log in. What can i do?
Ps. I’m using esign