Hello All, first time posting here in the hope that I'm not alone in my current dilemma and some advice might be forthcoming.

My 2013 XF has just had its annual ('B') service. The garage is a long-established Jaguar-accredited service centre. Although the car and all of its systems were running perfectly, I remarked to the engineer that the 'low battery message had been appearing recently and would they check them both out. It transpired that the primary battery was less than 50% efficient and the secondary was pretty useless, so I had no hesitation in ordering replacements at a cost of £350. I was also advised that the car had to be reprogrammed - to tell it that it had new batteries! (£65).

This is where the trouble starts. When the battery was reprogrammed, it knocked-out the key fob; when the key fob was reprogrammed, it knocked-out the central locking; the central locking knocked out the air conditioning, the air conditioning knocked-out the audio . . . . and so on and so forth!!

My recollection of the sequence might not be correct (I'm no technician), but you get the idea - each reprogramming attempt disabled the next function along the line.

Having spent many diagnostic hours (for which they refused to charge me, I'm pleased to say) the perplexed engineers declared that the only remedy would be to 'wipe the system clean' by fitting two new fuse boxes (£1,100 !!).

It worked - but replacing my batteries has cost me over £1,500.

Can anyone offer any consolation that this is a 'thing, or should I take the matter up with Jaguar ?

Thanks.

 

How a fuse box replacement is needed for an ecm and bcm reset is beyond me. Hopefully they are Jaguar approved.
Looking forward to hearing how this plays out.

 

Yes this is a known and EXPENSIVE problem. See the attached TSB. The newer cars have changed a lot. Junction/Fuse boxes no longer just hold fuses. They have active components in them and lot's of error codes too.
Strange thing is the problem seems to be limited to just the XF?

It's really sad there are no published repair procedures and Jaguar's answer is to replace the junction boxes. I have seen at least one person use a DMM to find the bad components inside the junction box. But I have no idea what he replaced or how he identified what was bad?
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ahh, the junction box. yes.