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Discussion Starter · #1 ·
Hi - I have a 2015 XF Portfolio and I have a list of electrical issues that have started over the last couple of months. Wing mirrors won’t close, rear windows won’t open at all, steering wheel moves in/out & up/down, without warning, the boot only opens with the button on the dash. I am getting a battery low warning - would that be causing the issue? I know nothing about cars by the way! Go easy on me. Thank you in advance for any replies or advice.
 

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you need charge current battery, trickle chargers are not that expensive (i got one from lidl for ~£35 and it works a treat). if that wont revive it to what it should be, then new one should sort the issue for sure(y)

jags are known for electrical gremlins to occur when battery is out
 

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Discussion Starter · #3 ·
Thank you for your reply, really appreciate it. I bought a battery tester and both batteries are showing as fully charged and “good”

I have booked it in with my local Jag dealership and it’s £190 an hour! Scandalous
 

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Do you have a good Jag independent garage nearby? I would stay well clear of the Jaguar main stealers. The Jag indy's I have used charge around £80 per hour and I would trust them to do the job properly.
 

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Discussion Starter · #5 ·
Yes, unfortunately I have been to the best guy around and it was him who recommended that I go back to the main Jag dealership as his diagnostics could not find anything. I have searched for other specialists in Northern Ireland however have had no success thus far! Thank you for your reply.
 

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Thank you for your reply, really appreciate it. I bought a battery tester and both batteries are showing as fully charged and “good”

I have booked it in with my local Jag dealership and it’s £190 an hour! Scandalous
fully charged or good on tester doesn't mean it's at peak performance - i can't remember, but battery to be deemed as good by jags, it needs hold 12.4V with engine off and 14.4V when on - I'm sure i will be corrected regarding the exact V's, but something along those lines

£190/h, that's steep even by jag standard's :oops:
 

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2012 XF V6 3.0 litre Diesel
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They key metric to check is the CCA (Cold Cranking Amps) value to the rated CCA on the battery. The value your check should be greater than the rated value of the battery (by default it's 850 CCA by memory but double check that).
 

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Whilst the battery is often responsible for strange behaviour, that normally brings up lots of random messages, as various systems shut down, to provide enough power for critical systems. The boot loom can sometimes cause issues, but mainly relating to the camera/ lights etc. The only issue I've heard of which could well be affecting yours is the CJB (Central Junction Box) which can get affected by water ingress, which normally finds it way through the wiring loom, so maybe get someone to check the wiring from the windscreen washers, to see if there's a leak which is causing shorting/ corrosion in the CJB, which will cause all sorts of random electrical problems. Unfortunately, fitting a new CJB is apparently very expensive (£1000 plus?) but there are places which can sometimes repair them or you may be able to source a secondhand one.
 

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Do it the simple way: buy a new AGM battery, fully charge it and replace the old one. Sometimes shops that sell batteries will help you with the work. 80 Amp-hours minimum, 850 CCA. And start using a ctek or similar quality charger.
Jaguars xf's are notoriously fiddly when the battery in insufficiently charged.
 

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Do it the simple way: buy a new AGM battery, fully charge it and replace the old one. Sometimes shops that sell batteries will help you with the work. 80 Amp-hours minimum, 850 CCA. And start using a ctek or similar quality charger.
Jaguars xf's are notoriously fiddly when the battery in insufficiently charged.
Yes, but you're assuming that the battery is the issue, whereas I'd look into the CJB first, as it sounds more like that could be the problem.
 
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