I have now had this a couple of times, and basically the dealers always default to 'junction box' regardless of the issue. The first time is the one I wrote above - I went to another dealer who identified the central locking issue was because one of the door locks was out of alignment so it tried to lock but couldn't.
I also had another experience a year or so ago now. My car was in for paint correction and - for whatever reason - my secondary battery went flat for a few days. I got the battery replaced, but by that point it had forgotten the keys. I had to have it towed to a dealer who (quickly) reset the keys. One of my controllers didn't reboot - but it's so trivial I don't really care - and every reboot risks making a junction box problem.
The reason I dropped back in is that one of the absolute technical stars of the Jaguar community based in Sydney mentioned the old 'junction box' excuse. This is a link to their FB feed https://www.facebook.com/oldjaguarau and scroll down to September 2022 (In case the forum software plays up, they are oldjaguarau on FB)

 



 

2014 XF250 facelift 2.2 UK Spec
SDD 138

Hope someone can help

I ran the SDD all nice and good, I ran the 'battery changed' and the check batteries, again all good.
But the keyfob still doesn't lock.

I scrolled step by step through all the service options and nowhere was there mention of the imobilizer (Imobiliser) so I can't run it.

Can anyone help me to locate this on the 138 please.

Much appreciated
63years 4 months, size 7.5 shoe, although 8 in sports shoes. No banana required. YES I';m a member of the dull men club!

 

This was copied from another site............

​​​​​​Issue one most common:

Car won't lock after battery disconnect. This is solved via immobilisation in SDD.

Issue two less common:

Key not recognised at all hence no ignition, immobilisation not possible.

This is done via cluster reprogram as it will bypass the key sequence, turns ignition itself and do the immobilisation at the end.

This will also update cluster to latest software, bonus.

 

Thanks,

As I said,
I have the SDD, but there is no mention of immobiliser, which is why I asked :-)

 

I can see it in a picture in this thread #31

 

The SDD JLR is a great way to do it but I ended up using the Autel I own. Did a run on “battery replacement” (both batteries) and “immobilization” and the locks started to work again. I’m sure if you visit a mechanic shop they have an OBD2 that is enough to run these test and I’m sure it will be much cheaper than what Jaguar will quote you!

 

Sono possessore di una Jaguar XF 2.2 Diesel anno 2015.
Sono state rimosse le batterie (principale e servizi) Installate le nuove, non hanno funzioneto le errature sportelli e portello bagagliaio. Non funzionano ne con telecomando ne con pulsanti interni ne con chiusura dello sportello. A volte faceva fatica all'accensione del motore. Le officine Jaguar (non conoscendo il problema) riferivano di avere la macchina per alcuni giorni per fare la diagnosi e sostituire (forse le cantraline). Purtroppo era un lavoro necessario. 200 euro solo per la diagnosi, poi il costo dei pezzi non funzionanti.
Sono stati provati molti metodi, staccando le batterie per alcune ore. Non c'è stato modo per risolvere. Improvvisamente non partiva più.
Senza acquistare oggetti o software, ho consegnato la macchina ad un amico (officina installazione impianti a gas/metano) che con la sua apparecchiatura di diagnosi (ultima generazione) è riuscito in pochi minuti a ristabilire l'accensione dell'auto e cancellare tutti i guasti. Adesso l'auto funziona perfettamente, le chiusure funzionano perfettamente e l'auto si accende regolarmente. Non è così cosa ha fatto. Con 5 minuti, senza cambiare pezzi, senza usare i vari software citati è riuscito a ristabilire la normalità (da quello che ho sisto ha effettuato il reset batteria servizi per 3 volte consecutive e improvvisamente si sono attivati ​​i motorini delle chiusure. Possiedo una Jaguar XF 2.2 Diesel anno 2015. I own a Jaguar XF 2.2 Diesel year 2015.
The batteries were removed (main and services) New ones installed, the door and trunk locks did not work. They do not work with the remote control or with internal buttons or with closing the doors. Sometimes it had difficulty starting the engine. The Jaguar workshops (not knowing the problem) said they had the car for a few days to do the diagnosis and replace (perhaps the centrals). Unfortunately it was a necessary job. 200 euros just for the diagnosis, then the cost of the non-functioning parts.
Many methods were tried, disconnecting the batteries for a few hours. There was no way to solve it. Suddenly it would not start anymore.
Without buying objects or software, I gave the car to a friend (gas/methane system installation workshop) who with his diagnostic equipment (latest generation) managed to restore the car's ignition in a few minutes and erase all the faults. Now the car works perfectly, the locks work perfectly and the car starts regularly. I don't know what he did. In 5 minutes, without changing parts, without using the various software mentioned he managed to restore normality (from what I have gathered he performed the service battery reset 3 consecutive times and suddenly the lock motors activated).