Hi, I have a 2008 Jaguar XF 2.7D and there has been a total electrical failure.

Only the central locking, seat adjustment, position lights, interior lighting and steering wheel adjustment work.... practically everything that should work with the ignition off. The radio display sometimes works, sometimes restarts over and over.

The starter switch light pulses but does not respond when pressed. The instrument panel won't light up, the steering wheel won't unlock, and the handbrake won't work either.

The instrument panel only comes to life when I want to apply the handbrake. It shows that the handbrake cannot be activated.

The car was taken to Jaguar service, car was diagnosed faulty and it was stated that it was not worth repairing. The dealer's towing service further damaged the steering.

I have a Delphi diagnostic adapter, I wanted to read the faults but the only unit that responds is the air conditioning.. the other units did not respond. I have two keys, both have a new battery... The car doesn't seem to communicate with the keys, when you press the door button the car honks...

So far I've only found the rear BCM unit in the trunk, it had some oxidation on the connectors, I cleaned it.. I also checked the front junction box, also fine.

The battery is charged, fully functional, also tested with a booster..

Thanks for the advice.

Karel

I'm using a translator, so it's possible that something won't make sense.

 

Based on what's not working, I assume the problem is in the front BCM unit. If I connect a unit from another car will it at least work somehow, or until it is reprogrammed, will it not work?? I have a borrowed SDD diagnostic and the status of the units is as follows:

 

We did not get those cars in the US so I can only suggest that all those red "X"'s must be cleared somehow.
Can you explain a bit what the dealer meant by the car is faulty and NOT worth repairing?
Maybe they found a bunch of expensive stuff bad?

It's great you have a working SDD and keep at it because you have a list of modules not communicating with SDD. Now you cut off the top right hand corner of the SDD screen?
Is the battery symbol green in SDD? Are you running a DC power supply attached to the car when using SDD and NOT a battery charger?
Also note that even with a properly tested/charged battery you might be ahead to temporarily try another fully charged battery? How old is yours now?
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I bought the car in this condition, so I don't know its history and I don't know exactly what was found in the service. I have the car plugged into a power supply during testing and the icon in SDD is green, of course.

It can now connect to all units, probably a CAN bus problem. The errors are in the communication mainly with the instrument module, but also between other modules..

 

yes if you put in a new fsjb it will communicate but then you need to jump through hoops to get a used module to work

 

Great progress as all the red X's are gone but as Xalty says you have a bunch of modules with errors in them.
Xalty do you mean to go in and reprogram the existing modules as a if they were all new?
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I didn't change any units, it gradually started to work by itself.

I'm thinking the CAN bus is the problem. Interestingly, the units at the very front of the car (lights, transmission, engine) and the units at the very back (parking assist, EPB) have the most communication errors. In SDD, the VIM (steering column lock) unit is marked as optional. But if I have a keyless car, should I have that unit or not? Also, the TPM is not reporting to me, but I'm not sure if the car is equipped with it. There are sensors on the wheels, but the wheels may not be original.

I would need to get a description and location of all the connectors on the car. I want to try to measure the supply voltage and CAN voltage on all the units. Next, disconnect all the units in turn and try to do the test without them.

 

The locking steering column seems to be a region difference?
In the US no column locks but I have seen it mentioned in SDD like you found.
So I can't say what cars got them and what cars did not?
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So the US version doesn't have a locking steering wheel?? So if I have a locked steering wheel, should I have a VIM unit and should I have it active in SDD?

I still don't understand why there are issues on both CAN buses. The only thing that connects them is the instrument cluster. It could be faulty, but I haven't found anyone on the XF who has dealt with the same problem.

 

Just a long shot?
With things coming back slowly it kind of mimics what happens when a car gets flooded?
As the harness and plugs dry things start working again.
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got that message on my 2012 xf portfolio when I was doing the service reset after oil change
like wtf then all the power windows didn't work and I cycled the car on and off letting it run just in case
so power windows now work as normal except the drivers side window
wont roll down until I turn the car on and off again then it's very finicky ..
easy fix?