What is the quickest way to disable the air suspension system if I need to jack up one or two wheels? The owners manual says to never jack just one wheel but I have two floor jacks so I can jack two at once.

I read somewhere to pull fuse F52 from the rear fuse box, is that the quickest, safest way to do it? Turn the car off, remove the key, and then pull the fuse before I jack and then put it back in once the car is back on the ground??

 

Owners manual says "never to jack just one wheel", but what happens when you're at the side of the road and jacking up one wheel to change a flat tyre ? You have four jacking points, two per side and insert the jack next to the punctured tyre wheel.So when you jack you're jacking one wheel ! Where this nonsense comes from in Jaguar I do not know. The air suspension module is well able to detect jacking movement as it knows (1) engine is not running and (2) car is not in motion. Probably you need to make sure the ignition key is removed.

 

The reason you are "not supposed" to jack up the Aluminum bodied XJ by a single corner is so as not to warp the body.

However what choice do you really have out in the boonies when you want to change a wheel?

I currently have my car jacked up at the rear for work I am doing.

I disconnected the battery before doing the jacking as I have done in the past.

There is a procedure you are supposed to go thru when the battery is re-connected to re-adjust windows etc.

I have never had a problem doing this. However I only jack a corner up just enough to get the tire off the ground.

 

This (disconnecting the battery or pulling the fuse) is probably the right way to do it, be it for a tyre change or a shock replacement.

I have noticed however, when I swapped wheels for winter, not knowing the right procedure at the time, that the ASM is clever enough to order a correct resetting of the height when the car is put down: first the car dives, but soon after it catches up.

 

The X350 New Model Introduction Dealer Service Training Manual is where the warning is given to raise two corners simultaneously to avoid torquing the aluminum monocoque. The Owner's Manual does not contain the same warning, but does caution to raise the vehicle only until the tire just clears the ground. I think somewhere in the forum I have posted a scan of the Dealer Training jacking and lifting instructions. I have raised only one wheel a few times, but for any significant lifting I raise two wheels with separate floor jacks.

To answer 06-XJR's actual question, while some owners have had trouble with their cars seemingly stuck in Jacking Mode after raising the car, I never have. Our '04 XJR seems to recover as soon as it is driven faster than 3 mph, per the Air Suspension & ECATS section of the Dealer Training manual.

Cheers,

Don

 

I was afraid this would go off to discussing the monocoque structure and debate raising it by one wheel. Sigh.

So has anyone else done that fuse pull procedure and can report that it is good?

 

I've pulled fuse 52 on several occasions and works just fine, then put it back in once it's all back on the ground. I have also jacked to change a wheel without pulling the fuse and also had no issues.

 

Ditto on jacking 1 just high enough to pull the tire or jacking 2 to raise higher.In either case I didn't pull the fuse or disconnect the battery and have not had a problem once the car was back on the ground and restarted. It levels itself back out before I have backed out of the garage.

 

When jacking the vehicle, raise both sides. Remove the key from the ignition barrel before raising. No need to remove battery or fuses.

 

First two times I jacked my car up I couldn't get the jacks out when I lowered it to the ground and had to faff about with blocks and smaller jacks etc. Transmission too low warning came up but cleared when I drove the car. Always take the fuse out now and never had a problem. I marked it with a marker pen for easy identification as the old peepers aren't what they used to be.