Hello.

New to me, 2004 xj8 100k miles.

Has the parkbrake fault condition which produces no trouble codes. The epb works properly, holds the car in place and releases when handle is lifted.

I have replaced the park brake module in the trunk and no change to error.

Also, receiving c1885 and c1893 for poor ground to rear height sensors. I have replaced the asu behind the rear seat which fixed the cats fault message but leaves behind the 1885 1893.

Do these items share a common ground point?

What is the best way to chase this down?

Thanks in advance.
-mag

 

Hi mag,

Congratulations on your new X350!

You have WDS or SDD, so that's a good start. Some documentation that will help includes the 2004 XJ Electrical Guide, which you can download here:

http://www.jagrepair.com/images/Elec...al%20Guide.pdf


And the DTC Summaries manual here:

http://www.jagrepair.com/images/Elec...al%20Guide.pdf


The New Model Introduction Technical Guide here:

http://www.jagrepair.com/images/Elec...al%20Guide.pdf


The Workshop Manual in six sections here:

http://www.mediafire.com/download/md...f+contents.pdf
http://www.mediafire.com/download/aa...nformation.pdf
http://www.mediafire.com/download/n3...2.+Chassis.pdf
http://www.mediafire.com/download/9b...Powertrain.pdf
http://www.mediafire.com/download/0i...Electrical.pdf
http://www.mediafire.com/download/4j...+and+Paint.pdf


And the Dealer Training Manual Air Suspension section here:

http://www.mediafire.com/view/7rdkgg...on_Section.pdf

Looking at the schematic for the Air Suspension in Figure 5.3 of the Electrical Guide (page 77 of the pdf file), the height sensors are Hall effect sensors, so all three wires of each sensor connect discretely to the Air Suspension Control Module (ASM). Unfortunately there's not a common ground point that you could check - any common connections must be in the ASM. The ASM is grounded nearby on the bulkhead behind the rear seat back. Was that ground point cleaned and resecured when the ASM was swapped? If not, it might be worth doing.

Clean the threaded stud, nut and wire ring/eyelet terminals with a soft brass brush and zero-residue contact cleaner spray, allow to dry and then reassemble. Note that the torque spec for the nut is just 6.5 ft. lbs., which is not far beyond hand-tight. Some of our members have learned how easy it is to snap the stud off of the body by overtightening the nut, so take care.

While you're there, it might be worth checking the pins in the connector for the ASM and flushing them with contact cleaner also.

If only one of your height sensors was triggering a fault, I might suspect chafed insulation on its wiring harness, but you wouldn't think that could happen to both sensor harnesses simultaneously. However, since you also have the EPB fault, maybe it's possible that the wiring for the height sensors and EPB actuator all come together in the same harness, which has been damaged somehow, causing a short or open circuit. It would be worth visually inspecting the harness for any obvious signs of damage, and I believe there are Pinpoint tests in the Chassis section of the Workshop Manual that will help you track down the problems.

Hopefully one of our members has dealt with a similar issue and will be able to offer help.

Please keep us informed.

Cheers,

Don

 

Thanks Don

I had pulled a bunch of those docs; just a matter of becoming familiar...

Starting with the electrical guide, I see the ground for the ASM shown as G17AL and I see its location G17. It appears to show this location as passenger rear foot rail. Are these drawings approximates or are they 'right on'?

Removing the seat is no problem; I will take a look for the ground point after picking up brush and cleaner.

In any event, thank you for the starting point.

-Mag

 

Pulled and cleaned the ground that looked like it is for the parkbrake module.

No good result with remedying the parkbrake fault message, but got some good pics.

Thanks
Mag

 

Pics

 

Maybes this should have been two threads, but switching topics to the c1885 and c1893 and the suspension module behind the seat.

As Don suggests, am looking for the suspension module's ground point behind the seat. So here are some pics behind the seat.

So, I did not see anything that resembles the stud/nut ground like those in the trunk.

Thanks
-mag

 

But I do find a connector (passenger side under the seat bottom) which appears to have some corrosion within, so it's taken apart, cleaned and reassembled.

Take a look.

Thanks
-mag

 

Cleaned connector multiple times. In my experience, the 22 way connector can create a bunch of weirdness with dash messages.

Throughout the day and through various stages of cleaning, this area has resulted in gas gauge reading empty, abs light, DSC light, suspension fault.

Good news is that I believe that the parkbrake fault has been remedied. I believe that is result of cleaning the 6 way, grey connector.

I have been to the store and back with no current messages or lights. Fingers crossed; more pics below.

Thanks
-mag

 

Cleaners

 

mag - from what you describe in the original post, is sounds like someone was working on the rear suspension prior to selling you the car. Anytime the battery is disconnected you need to follow the procedure for recalibrating the parking brake. I don't have this exactly right, but its something like pressing and releasing the brake pedal 5 times, then holding the brake pedal down and cycling the parking brake on and off 5 times by lifting and then pressing down on the little lever rearward of the shifter (wait for it to fully cycle in each direction before the next lift or release.

The C1885 and (highly likely) the C1883 are from not strictly following Steve-tech's procedure when servicing the rear air shocks or rear control arms. I know this from hard, somewhat expensive experience. I changed both the rear air shocks and both passenger side rear control arms (upper and lower) and half way into it realized that even leaving it in Park, without applying the brake with the leaver, still applies the caliper. You cannot get the rear lower control arm off without removing the caliper. I had already anesthetized the ASM/DSC by disconnecting the battery, but I had to re-energize it to get the shifter into neutral and release the rear caliper. I tried to get the ride height sensor in about the same place I had it when I disconnected the battery, but failed. This caused a stored C1885 (rear passenger control sensor shorted/open) but nothing on the message center - just a rock hard ride (brief flash of "DSC not available" on some start ups). I had to take it to one of the local foreign car places, they used a Snap-On code reader/interface to clear the C1885 code and (I think) do a hard reset of the suspension. I have heard of people achieving a hard reset of ASM/DSC by disconnecting the negative battery lead and touching it to the positive lead for 5 or 10 seconds, but I was too chicken to experiment and thus am $80 poorer. Not sure if the JLR-Mongoose setups can do a hard reset of ASM

Along the way I found the answer to bezzy's buckboard ride quality, but that doesn't seem to be your complaint right now.

 

Thanks for the thoughtful reply Zak.

Turns out the majority of the issues were with the 22way corroded connector.

With good connections in place, have had zero (knock wood) issues for 1000 miles or so.

Thanks again
Mag

 

Update 3000 miles, no issues.

-mag

 

Magmedia
not at all surprised the issue is connector related. I have had a few connector issues as well on my 2004 XJR. The factory connectors are not at the level one would expect for an $80K car. I have also cleaned the pins on corroded connectors with fine sandpaper then used spray cleaners. Good photos to document your resolution
RyeJag

 

Nice one Mag, are we putting this down as affix then?
If so please let me or one of the mods know and we can add RESOLVED to the thread title, it may help others.


Thanks

 

So this brings the question, where's the water/moisture coming from? Connectors don't just corrode themselves.

 

Did not mention, cleaned the sunroof drain tube which was the cause of the moisture.

Did this while replacing headliner.

"Eww" alert...

Thanks
Mag

 

Photos

 

Don, I need The height sensor repair harness [connector] for C2C2242. How do I get a part number. PS, found a mechanic recommended by local club, but still want to dabble. 2004 xj8

Bob R.

 

Hi Bob,

Let me know which thread you intended to post this to and I'll move it for you.

Regarding a repair harness, the parts catalog doesn't make it easy to find something like that. Your best bet is to call a Jaguar dealership and see if you can sweet-talk the person at the parts desk into helping you. If Jaguar no longer offers a repair kit, perhaps you could get a connector from a salvaged car?

Cheers,

Don