Seat is out for a failing recline feature. Seat back is reclined and will not go back up. Before I removed the seat, operating the switch for recline resulted in a sound like it is trying to move but is stalled. With the seat out of the car and on the workbench, I need help identifying which motor/gearbox actually is for the recline. I have attached a pic and marked each motor/gearbox with a colored arrow. I am thinking the motor marked with the red arrow is the forward/backward traverse, the motor marked in green is for raising/lowering and the orange marked motor is the recline. Please help me out. I've searched at length and have not found an answer. Thanks!

 

Sorry, it is a 2006 XK8 convertible.

 

Never mind....I found that the recline motor/gearbox is in the backrest! These seats have five motors! Someone has been into this one before. The headrest motor is gone, well almost. Found it and the drive cable in the glove box. Hardware is gone however. Ugh! Achieved what was intended. Got the recline set to where is comfortable and left it there. Probably have a bad module as one trace was suspect. Didn't try swapping modules, probably should have to narrow down the issue. Anyway, that will be for another day.

 

Info for you.

 

Thank you for the info. I believe the next thing for me is to swap seat modules and narrow down the recline issue. What I've done so far is eliminate an issue with the motor/gearbox as I've run it both ways with a separate power supply. So, it is either the module, most likely, or the switch. Seeing as how the seat will recline with the switch but not come back up further reinforces the thinking that it is the module. Disconnecting the battery caused the windows to come out of calibration, easy fix but I hope the convertible top operation was not affected.

 

I swapped seat control modules and the recline issue moved. So...I need a replacement/repaired module and a couple new housings as both of these are broken. Anyone know if Darrell in San Diego still repairs these boards? There is another place called Module Master. I will make a couple calls tomorrow and see. One thing I noticed was the passenger seat module only had two plugs going into it whereas the driver's side has three. Maybe it is for the missing headrest circuit??

 

I also have a seat recline issue with my 2005 XK8. After taking both seats out to replace the hydraulic roof hoses the passenger seat back was stuck in the forward position. I was able to recline it by applying voltage to the two wires feeding the motor in the seat back. On checking the seat control module is bad. It has a previous repair that jumpered some bad tracks on the circuit board. There were two soldered connections on component marked ULQ2004 which is a Darlington Array - whatever that is. The jumper wire for one has broken off and seems to have broken the connector on the array. I obviously did this when I took the seat out ( the case was cut away to allow space for the wire and was just covered with tape. So, i have a seat now that moves in all directions except moving the recline forward. Not too bad I suppose. Sorry for being so long winded, I thought a little background would help. So I think my options are:

1) A replacement (used) module. It seems the later modules are a lot more expensive than the earlier cars. My car has only two connectors under the drivers and passenger seat. Would an earlier module work?
2) Is there any chance my module could be repaired. It seems there are unused pins on the darlington array.
3) Just live with it!!!

Any thoughts would be appreciated. I am located in Canada so local repairs/parts would be best.

 

I am in process of contacting a couple repair places. Kinda disappointed Jaguar mounted the module in the manner they did. I am gonna see if an improvement can be accomplished once I get a good module.

 

I have emailed Module Master about the specifics of my module repair. I think it may be a goner !

Used modules are available in the UK (Auto Reserve specifically) and on Ebay. Expensive for later years though.

 

Keep in mind procuring replacement modules usually involves needing to re-code/pair them with the car again with the proper diagnostic equipment. If not done, it has been reported the seat heater function may not work. This is why it is normally best to try and repair your own module.

The more complete answer is that the part# also involves a VCATS#, usually listed on a sticker by the spare tire. I believe the same part with the same VCATS# would work without re-programming. Problem is, resellers typically do not list the VCATS#.

Separately, but related, there was a time when Jaguar sold replacement seat control module lids for very little money. Not sure if this is still available today.

Best of luck, keep us posted.

 

Pulling up the ULQ2004 datasheet, it looks like it is a straight amplification from IN pins to the corresponding OUT pins on the other side. In your pic, IN seems to be on the right, OUT on the left. As you mentioned, it seems there are 3 unused pairs near the bottom. It is likely a matter of shunting the IN corresponding to the broken OUT to an unused IN, and then re-solder the yellow wire to the corresponding OUT pin.

Interesting problem, quite possibly solved for near $0.

Best of luck, keep us posted.

 

Decades old Tech Tip we got related to the configuration of modules 'back-in-the-day'.

I actually called Jaguar Tech Line before the Tech Tip was issued and was instructed on how to 'get-around' the problem of not finding the application with WDS.
Shortly after, Jaguar issued the workaround Tech Tip for configuration.

Models – XK8/XKR 2001/2002 MY
Symptom: PECUS D or PECUS P warning after replacing seat modules
Information: After replacing one or both seat modules, a technician will see a PECUS message on the dash. When looking on the WDS, there will be no programming option for the seat modules. To repair a tech must locate a 2003-04 XK, install the seat module in that vehicle, and then program with WDS. The only side that can be programmed is the driver's side; therefore a passenger seat module must be placed in the driver's position and programmed. After programming install modules in original car, PECUS message should be gone.

 

Not having Tony Stark ability, I cannot see a "bad" spot on my board. I'm gonna give Module Masters a try and see what happens.

 

You can always use an OHM meter and check the continuity from point-to-point to see if the copper trace is complete?
I use a stainless steel NEEDLE to 'poke' along the copper trace to find a break in the circuit.

 

I did a little of that but the needle idea is great advice. I was a bit concerned about doing this as voltage is applied in its application even though it is slight.

 

Module is off to Module Masters. I will report on how this turns out. I attempted to touch base with the guy in San Diego but didn't receive a return call.

 

I am going to try a board repair. Module Masters didn’t specifically say they could repair my board, but offered to look at it. The issue for me is the freight cost to Canada adds US$70 to the repair. Plus who knows if I will be charged duties at the border. These days anything is possible. I think a repair is possible because I am just fixing a previous repair gone bad. I am in no rush to do this as my seat recline is in an ok spot. This forum has been great for getting info on this issue. Thanks to all !!

 

I jumpered the uLQ2004 pins as you suggested and the module is now back in the car and working fully. It required some careful soldering as the connections are very small. Thanks for the help @fmertz

 

My board is supposed to be back in my hands today. Tech said there were "several bad circuits". Anyway, I'll report the results. Total cost around $150 including shipping, so far....

 

Success! Installed repaired board today and all functions are working. Very happy with my experience with Module Masters. The repair is warranted for five years. Very well packaged upon return, overall great experience. I usually perform all my own work but these old eyes just couldn't see the issue. I would definitely recommend Module Masters for circuit board repair.