Look forward to being part of this forum.

I do love my Jag but can't say it hasn't had several problems and the official services have so far with exceptions been terrible.

A bit of history:

Its a 2006 Jag Sovereign 2.8 Diesel X350. Bought in Stratstone Manchester.

Only 35,000 true miles on the clock as it had a catastrophic engine failure at 20,000 (1 in 5000 according to Jag Brussels).

Next service Jag in Brussels failed to connect one of the injectors properly so the car was smoking everywhere until finally we had to stop in Germany and get it fixed. Next service Jag in Reading failed to reconnect the fuel lines properly so the car was leaking a trickle of diesel and again smoking during longer use, had to stop and get it fixed.

The current problem:

So now the next problem has occurred. Car has recently been serviced. A few weeks ago it showed a "bonnet open" message and then "rear doors open" message, later during the week a "Service required in 1200 miles" message. After being stood for 2 weeks, now the car is undriveable as the whole air suspension is not lifting and message reads "Vehicle too Low" with red light, it is very rough to try to drive it on the road. All the messages continue to appear except for the "rear doors" message which I have not seen since.

I took it to a very good local garage (I normally only take the car to official services) who hooked it up to a diagnostics computer (they diagnose and service many Jags etc.), they were able to connect with the computer but beyond vehicle details it refused to communicate with them signifying there could be an error of some sort. They also disconnected the bonnet electrics but the "bonnet open" message was still showing further suggesting this.

They've suggested that I'd better go to Jag to diagnose it, because if its a computer issue Jag have to deal with it.

Anyway does anyone have any ideas or suggestions before I fork out yet again for a Jaguar official service/repair?

 

I don't know where you live exactly, but XJK Jaguar of Newcastle-under-Lyme are very good, (they fixed my car so it is finally fault-free since 2010, - touch wood, of course !). It sounds like your compressor has packed up and thus car cannot raise itself.

 

Hi Fraser,
Lancs & London. I don't think its the compressor, because very oddly the car raised itself today and showed no faults, then when driving the bonnet open light start intermittently flashing on and off again, the car then slowly started lowering itself but not completely, just "suspension fault" this time. I am told if the bonnet is open the car suspension will deflate.

The service required notice in 1200 miles has gone.

I read somewhere on this forum that a corroded earth cable can throw mayhem into the electrics when there is low voltage, I'm trying to find the very link again.

Also if it was just the compressor it doesn't explain the rest of the faults and the fact the computer did not wish to communicate with the diagnostics.

 

There are three earth points at the front of the car behind the radiator, mounted two on the RH side and one on the left in direction of travel. These are the ones that can corrode badly, as they're directly in the air stream, so get all salt laden air etc. You access them by taking off the black panel at the front of the engine which covers the top of the radiator.

I have to say, I never heard about car lowering if the bonnet is opened, it doesn't do this on my car. Sounds like something is wrong, and you need a garage that specialises in Jaguars like the one I told you. If you want a main agent, I found Royles of Wilmslow OK.

You could have a defective height detector, front has one, as wheels are controlled together, two at rear, wheels controlled independently.

Essentially, you need those fault codes reading out. Get the car to XJK, they are really very good.

 

Hi Fraser, you may indeed be right.

Jaguar service seem to think the think the air compressor needs complete replacement.

 

I posted the previous message incomplete by mistake

Hi Fraser, you may indeed be right.

Jaguar service seem to think the think the air compressor needs complete replacement, they didn't sound sure about the rest, which worries me.

They couldn't really explain why the Bonnet open and Boot open (it was in fact not the rear doors but the boot open showing) warnings came on a few weeks before the suspension fault. Car seems to just be saying suspension fault.

Like you say I don't think the bonnet and suspension are linked, Jaguar said that a low suspension height could make the bonnet open sign come on??

I will definitely give XJK a go in the future.

 

Could anyone let me know the part number of the air compressor relay and exactly where the relay for the air compressor is located? Would be appreciated. This is for a 2006 XJ Sovereign

 

Ok I seem to have it. Can anyone confirm its fuse R4 on the driver side fuse box under the bonnet, with numbers V23136-A1-X20 40/30A , LJA6707AA?

I also seem to be missing fuse R7 and F35? Is that normal?

 

I think thats the last time I'll go to an official Jag garage unless I'm under warranty with a new Jag (and considering the new models I don't think that'll be the case).

I was told I needed a new compressor, managed to buy a new Wabco one from Holland.

Anyway took it to a very good local garage in Rochdale instead, we replaced the compressor but the problem was still occuring. Also the LH side head light was flickering. Opened up to get at the Headlight, turned out that a bolt had detached and two earth cables had come loose. Once these were properly earthed again everything including the air suspension was working fine.

It is likely there was nothing wrong with the old compressor it just lacked an earth, so so much for official dealer diagnostics. Anyway at least I have a new compressor and a spare old one.

A gentleman in Glasgow had this very problem on this forum but I cannot find the thread. So it may be of note to people having air compressor problems to check the earthing cables on the LH side headlight before going further.

Is anyone able to confirm the relay for the compressor is R4 in the relay/fuse box? The garage seemed to think it was R1 others say it is the brown one but that is R3?

 

It is R1 in the engine fuse box according to the wiring diagram.

 

Thanks meirion1.

The garage also told me it should be R1, I will have to get that ordered.

Strange as I read in several places it was R4 others said the brown one (which is R3).

Is there any chance of seeing the wiring diagram does it come in a PDF?

 

It's all here:
http://www.captainjaguarscathouse.co...ec%20Guide.pdf

 

Thanks meirion1, nice to have.

It's quite daunting for the uninitiated, tried to make head or tails of it, out of interest just where does it indicate that R1 is the relay for the air compressor? (which I gather is part of the "Dynamic stability control module"?)

 

Section 5.3, left of air compressor it says R1 in the relay box also described in text associated with this page.

 

Many thanks!

 

I recently purschased a 2006 2.7XJ diesel sovereign, having gone from an 2000 xj8. I didnt notice on the test drive,however the more i drive this new one, ive noticed I can feel every bump in the road, my old xj8 just glided. The suspension feels like its working and the car isnt showing any faults.
Is this normal with air suspension????

 

Doesn't sound right to me, mine is like sailing on a yacht smooth! Gliding is the right description!