So it does, from the Nanocom HEVAC document:
Attention: If the BECM is unlocked, the vehicle server might not be able to communicate with
this ECU. In order to bypass this, unplug the white connector (the one nearest to the front)
located under the driver seat (RHD) under a removable panel in the fuse box.

When I first got my car, it had an indicator stalk without buttons for the trip computer although the wiring was all there. I bought a stalk with buttons but the trip computer still didn't work as it was disabled in the BeCM. A local independent had a genuine LR Testbook and offered to enable it for me. While in there he checked everything else, found it was unlocked and told me it shouldn't be left like that as it can cause all sorts of problems and it would be best to lock it. So, not knowing any different, I told him to do it. That was 13 years ago, so the rumours have been around for a long time. Quite why it was unlocked I've no idea but I suspect it had been left like that from LRSV as it was built for a police force and they had no idea what plod might want to do to it......

There is still a dedicated Faultmate forum run and maintained by Blackbox. A wealth of experience but not so much activity on there these days.
I can remember comments by other owners about the Hevac. There have been one or two occasions when I had to have more than one go.
Not sure about the Nanocom as I don't have one. I assume the coding will be similar. Is there a Nanocom forum ?

https://forum.nanocom-diagnostics.com/

Inputs first then. I’ll try to remember.

Wow guys, that's a lot of indepth info.

Nanocom return from holiday on Monday. Hopefully I will have codes for it by the end of next week.

In case I loose the remaining key, I had a 'surfers' key cut from a photo. Works well (needs eka).

Once I am able to connect nanocom to enter eka easily, I will look at getting a new remote key. Mabe from Wales, maybe main dealer. I'm not hung up on genuine, so will probably go for Wales...

The key I had cut from a photo was provided by Jim from Cheshire auto keys 07971793704 jim.mann@virgin.net. Not cheap at £15 but it fits really well and he gave me the key number.

This was cut on a silka HU109FP blank.

My BECM has someone's mobile number marker penned onto it, so won't be surprised if is/was unlocked/virginised in the past. The EKA still matches jlr data but I will look at VIN....

Bolt wrote:
......, it would probably be easier and less expensive to have Les in Wales make you a new Key 2. Of course, if you are in the UK, the Stealership will be happy to extract a pound of flesh in exchange for a new fob!
Here in NAS land, we do not have that option......

I do have 2 keys from a previous p38. This will be a spares car until my neighbours start to moan. Maybe I could disable eka etc on the spares car? Going to depend a lot on the cost of the Welsh key.

Hi Gilbertd, any idea why NAS use a lower frequency? It was always odd that UKs 433 overlaps with the amateur radio stuff. Bristol had a 433 repeater (GB3BS) at a hospital until about 15 years ago.

The hospitals caretaker was able to temporarily disable the repeater when a car could not be unlocked.

No doubt this is due to poor performance of the cars receiver. I always suspected illegal Asian video relay stuff (watch cable in a different room) on 433. But if I remember correctly - local lowlife were using wireless doorbell buttons to block drivers from locking the cars.

Kbs wrote:

I do have 2 keys from a previous p38. This will be a spares car until my neighbours start to moan. Maybe I could disable eka etc on the spares car? Going to depend a lot on the cost of the Welsh key.

You would be well placed to use those keys without any outside help.....
Swap the Becm, Ignition switch, ECU, and drivers door lock from the spares care to your daily driver.
That will get the system working assuming the aforementioned parts are there, and are in working order.

Otherwise, have both Becms unlocked and read. That will tell the specialist what the lock set codes are. They can then input those into the other Becm.
Then get the spare one cloned to your current driver. This way, you end up with working fobs and a spare drop in Becm for your good one! (How cool is that!?)

Ooh, now into a subject I know a lot about as RF was work until I retired. Radio transmissions don't stop when they reach a National border so have to be coordinated. Hence the way the radio spectrum is used in the UK has to be coordinated with western Europe, which has to be coordinated with Eastern Europe and so on. The US only has land borders with Canada, who have had to accept the same spectrum allocations as the US, and Mexico that they don't care about. Hence the use of the radio spectrum in the US is totally different to the rest of the world. So they chose to use 315MHz, which was unused in the US but is in the military air band in the rest of the world. Their mobile phone bands are different to the rest of the world and the frequency used by their DECT cordless telephones, wireless headsets, baby alarms, etc are in the band used in Europe by 3 as a mobile uplink frequency. So anyone using US spec equipment in Europe can completely kill a local mobile phone site. I used to spend many a happy hour tracing these......

Going back to when RF was initially used for car security, it was different in just about every country, UK used 418MHZ and there were 3 other frequencies used in Europe alone causing a lot of grief for the motor manufacturers. So, CEPT (Committee European Postes and Telecommunications) proposed a standardised frequency for Europe of 433.8-439MHz for momentarily operated short range devices. There was one slight problem with this as it is within the amateur 70cms allocation of 430 - 440MHz but the primary user of the band is the MoD so the hams had to put up with it. What made it worse was that while amateur repeaters in that part of the band all use a 1.6MHz duplex split, in the UK it is base Tx low and mobile Tx high but in Europe it is the other way round. So the output of the base transmitter, usually running 25W, is on 433.0-433.375 with the input 1.6MHz higher up the band compared with Europe where the base Tx is upwards of 434.6. So in Europe the problem we suffered here doesn't happen as the base transmitters are far enough away to not really cause a problem. Initially, my employers at the time, the Radiocommunications Agency, mandated that these frequencies could only be used for RAKE (Remote Access Keyless Entry) devices but CEPT got a bit offended by this and insisted that it must be allowed for all short range devices, hence wireless doorbells, burglar alarms, remote controls, kids toys and numerous other devices all using the same bit of spectrum. So while these other devices shouldn't cause problems, as they are not something that will transmit permanently and are restricted to the same power outputs as the car keyfob, parking next to a site that happens to have a 70cms amateur repeater on it won't be a problem in Europe but will be a big problem here. Car manufacturers eventually moved to a dedicated part of the 868MHz band and in the last couple of years a lot, including Land Rover, have moved over to a far more secure spread spectrum system.

Most video relay stuff operated in a dedicated 10MHz chunk centred on 1394MHz but as 10MHz isn't wide enough for analogue video, it wasn't used much so 2400-2480MHz is used instead for video senders even though it is also used by WiFi. There was some illegal Chinese stuff that found its way here that operated in the 10GHz band but that was a bit of a problem as it is used for aero navigation. Another one that I spent more happy hours tracing.

Thanks for that info Gilbert!
I can just picture you in the Cat detector van looking for Tiddles!
Good fun alright!

Being a Ham, I used to love "Fox and Hound" Transmitter hunts! Ahhh the many misspent nights of my youth!
And to think, YOU got paid for it!

Our local amateur radio club banned me and a colleague from entering the fox hunts as they claimed we had an unfair advantage. Admittedly, we did win it 4 years running..... When dealing with hams I would often get asked if I was an amateur myself. My answer to that was, although I hold an amateur licence, I'm a professional as I get paid for it. Not active though I will admit as after almost 50 years playing with radio during work time, the last thing I wanted to do was play with radio in my own time.