Hello!

My powered drivers seat blows a fuse when pushing the buttons for the inflatable side support. Also, my massage won't turn off. The button on the screen is grayed out. Perhaps same problem?
I have tried to replace the unit with the buttons without any luck.

Does anyone have som pointers on where to continue diagnose?

 

Can you help us out?
Car details?
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2011 XJ-L 5L Supersport

 

If the buttons are greyed out I think you need to get the car hooked up to SDD. This is the factory Jaguar diagnostic software.
These types of errors are deep in the car and standard scanners can't read them. The car is too complicated to start changing parts so no advice until we can see what codes the car has.

I will say this is NOT a common problem so hopefully the codes should tell us what to do next. If your lucky a used part maybe all you need.
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Thank you. I’ll get the car diagnosed.

 

"Seek professional help." I hear that a lot.

 

Always hope to be able to fix problems myself. I believe that is necessary when owning an old luxury car. I’m looking into buying a complete JLR diagnostic tool.

 

Lyktestolpe I came to the same conclusion myself but be aware there is a good amount of work to get a working SDD as well as several different ways to do it.
I will say having SDD has saved me many dollars as well as helping several friends diagnosis their Jaguar's. Just making 2 keys for a friends 2008 XJ was a multi hundred dollar savings right there.
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What did you buy? I also neede a new key, so I ordered a blank original key on ebay for $90 (someone bought the wrong mhz version). I ended up buying the OBDSTAR H100. Still waiting for it.

If I knew more about SDD and special tools for diagnostics, and the fact that for a little more dollars I would get both a key programmer and a diagnostic tool in one unit, I'd buy that instead.

Now I'm looking at this thing, VXDIAG: https://www.aliexpress.com/item/3302...c008kx2Rs&mp=1

 

We have several very long threads on SDD and I am still learning new stuff all the time!
Here is a quick search and it returned 228 threads!! Information overload probably. Many places to get the SDD software.
SDD Info

I use a Mangoose clone of the old Drew Tech. device so I can't comment on that VXDIAG device. I don't think the Mangoose clone is still available either.
I usually only pay $20 or so for the correct key blanks on EBay. Including the FOB.
Here is one that should work. It's less than $20?
XJ Key and FOB
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I just use the Autel 906BT. It does everything I need it to like calibrate the air suspension, communicate (not fully bidirectional) with all modules and could pull any codes related to the seat module. Anything more complex needs to go to an engine professional, which I am not.

If you've replaced the fuse, go one step up the chain to find the mechanical (or electrical) reason why the fuse is blowing.

 

Lykestolpe, lets see if we can narrow things down for you. Would you please confirm that the fuse that keeps blowing is fuse F19 in the rear fuse box? If not this fuse, then which fuse is blowing?

Making a logical leap here that it is Fuse F19 that is blowing, then we are looking at a few potentials. You have ruled out the switch pack since you have replaced that. So, the next step I see is disconnecting the plugs for the solenoids and the air pump in the seat. Once you have those disconnected, put in a new fuse and push the buttons to see if the fuse blows. If it does, then this is leading to either a failed driver's seat control module (which would also explain the massage issue) or the wiring harness in the seat is bad (ie, has a pinched wire and it is shorting power straight to ground). If we assume that you can push the buttons and the fuse does not blow, then I would say to plug in the blower motor. Try pushing the buttons on the side to inflate the bolsters. Did the fuse blow? If yes, then your seat blower motor is failed and blowing the fuse. This will need replaced. If the fuse does not blow, then I would say to disconnect the blower motor and plug in the solenoids. Again, push the buttons to attempt to inflate the bolsters. The fuse should have blowing in this case. If yes, then you have a failed solenoid and it is blowing the fuse. You will need to get a new solenoid board.

Lets see what we have at this point and go from there.

 

WOW! That Autel scanner is over $1200!!
That is a good one for sure.
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Thank you for helping out here! I bought some new fuses to be able to dig in a bit deeper. Yes, it's the fuse number 19. Turns out that it's not the inflate function that blows the fuse, but the up-button that lifts the back support. Everything else seems to work, just not the up-function. It blows the fuse instantly without any motion. Is this a defective motor that needs to be replaced?

 

Lyktestople, the next part is going to require you to access the back of the seat. You may find it easiest to lean the seat forward some and sit in the back seat to work. Depending on the lumbar pump position, you may need to access under the seat.

What you are going to look for is the 4 solenoids that control the back lumbar support which appear to be in the seat back. Not sure if you can access them by removing the back of the front seat. But, what you are going to look for is a 6 pin plug (will have 4 wires attached to it from what I can tell from the drawings). You will want to disconnect this plug. This will remove the solenoids from the circuit. You will also want to look near the bottom for the lumbar pump (appears to be a rectangular object say 8 x 3 x 3 inches in size. There will be a plug on this that you will want to disconnect. Now, install a new fuse F19 and attempt the buttons (obviously they will not work). But, the big thing is whether this will cause the fuse to blow. If yes, then you have a wiring problem inside the seat that is going to require some pretty significant disassembly unless the wiring has tubes to run through. If the fuse did not blow, then connect the pump and attempt the button again. Did the fuse blow? If yes, then you have a bad lumbar pump (this would need to be replaced and not sure if you can get just the pump). If no, then your problem is the solenoid assembly. Again, can you get just the solenoids?