Gang, my 2009 XF suddenly and without symptoms, decided to go awry this morning. It will not start. The battery is newish and I am certain is not the problem. There are interior lights and door locks, but no steering wheel lock and when press the start button with foot on the brake, nothing happens. This is the same car that cost me $5000 a few years ago to get fixed when it decided to lose fob programming and blew instrument cluster, cpu, new fobs etc..... I am fearful I have a recurrence for no reason at all.

Couple of observations......there is a relay in the luggage fuse box that is continuously clicking if I try to lock doors. The seat adjustment light is blinking. Those two conditions did not exist when I had the first catastrophe years ago. I disconnected negative at battery and reconnected after a couple minutes, no change. I did same on positive side. No change. Out of desperation I inserted my spare fob into the docking port and the port has locked onto the fob now and will not release it. There are no messages on instrument display..nothing. Nothing is working, windows radio, nothing. But multitester showing more than 12v without load. (update......day after this writing the battery is completely dead. Car is completely dead)

I've looked all over internet for fuse diagram of 09 XF luggage, but I can not fine one that looks like mine. On mine there are three relays at the bottom of the board and the center one is the one clicking. Does anyone know what that is or any other ideas?

 

Do you live in a wet climate?
Had a lot of rain recently?
Even if not, I would check closely the boot at the back for water and then the plug connections in the various junction/ fuse boxes, again closely, for any signs of corrosion
if there is, it may be your problem

 

https://www.jaguarforums.com/forum/x...d-fuse-225268/

Could also be the alternator, but try charging the battery disconnected from the car for a solid day to see if it survived, should have 12.6+V across posts before reconnecting. If the car starts it should read 13.5+V consistent to confirm alternator charging it. If not replace with OEM alternator only, aftermarket is just more problems.

 

I'm loving the inserted comment from Dave Tibbs about fuel filler flap continuously opening and closing. What is the navigation screen starts talking and saying " I know what you did last summer"? 1/2 kidding. My particular 09 XF is unlike any car I've ever owned in my 70 year life.

 

I have has similar issues recently with my XF SV8 - do you have a sunroof? If so, check the drain tube front and rear of the sun roof, one or other may be blocked.
I have just had to replace the TPMS, heated and cooled seat and adaptive dynamics module. When I lifted the carpet behind the driver's seat, there was a puddle of
water and the foam attached to the underside of the carpet was full of water. I have the car booked in for some body work next week so I will get the garage to look at
the sun roof drains as well.

 

On mine when the battery goes very low I get that click click from a relay in the trunk. And that eventually completely drains it. On mine if I disconnect battery, charge it fully, then reconnect it works fine
If your battery was just 12v that's almost flat. So I think your problem was v low battery, the clicking is some module or system coming on and off repeatedly due to low battery and eventually battery is dead

So - try charging and check that it holds charge. Then reconnect and see if that works. You may have some parasitic drain on a circuit if it keeps draining the battery.