Hi, 1997 XK8 130,000 I am slowly resurrecting this car, and the 30th problem on the list is the passenger power seat, goes back and not back up. Has anyone had a similar problem, i already cleaned and checked the switch, the relay click in the seat module for down, but no click for up, are the module popular to go? a point in the right direction is always greatly appreciated. Chris

 

I just had the exact problem you have. Sorry to say it was a bad module and you can't buy one. I jumpered in a switch to run the backrest motor only. I made a small bracket so the switch was on the front side of the seat just under it. If you pull the seat out it is easy to see the wiring. I really like to keep things original but there isn't much choice here. It a module becomes available you can always convert the seat back.

 

Shoot! thats what i thought Martin, Thanks thats a good work around for now,
And i will be on the lookout for a module in the meantime..
Thanks again for your help!! god I love this Forum!

 

Most of the time this is a very common seat module fault, and can be repaired yourself if you have some basic soldering skill, or have a friend with some soldering skill, or take it to a local electronics repair guy. The plastic case wears away one or two circuit board traces at the edge of the circuit board. You carefully solder a thin wire to repair the traces.

See http://forums.roadfly.com/forums/jag...9317317-1.html

and https://www.jaguarforums.com/forum/s...+module+solder

 

Thanks, Yes i am very good at soldering, i am now going to remove the module and check it out, right now! its 11:30 PM here and they think i am nuts! This is great because i really did not want to hang another switch as a work around.. Thanks.. Chris I will let you know how i make out!

 

That was a great piece of information, Removed the module, found the bad circuit trace "with a magnifier glass" soldered it, reinstalled it, and bingo! Saved me a lot of diagnosing time, and now i go onto repairing the other 20 problems Thank for all your help! Chris

 

Congrats on the successful repair, and thanks for posting your results!

 

Hey! Great maybe I can fix mine too. Why does it wear away? There aren't any move parts in the module. Sorry crisant on the bum stear.

 

I'll put my EE hat on:

Two reasons.

First this was a poor printed circuit board design. The thin copper foil printed circuit traces were designed so that they come in contact with the plastic case. Over time vibration causes the case to rub against the copper, wearing it away.

Second, the module was not conformally coated with a material (usually an acrylic or urethane is used) to protect it from environmental contaminants, which attack the exposed copper areas at the edge of the board over a period of years.

 

Hi, Also having soldered the bad circuit trace, if you lay the board back into the plastic case, you will see the lip of plastic that rubbed the circuit board, i got a razor knife and shaved aprox. 1/16 of inch of the lip, so know it will not effect the repaired circuit trace, hence still plenty of support for the board. Thanks for all the help and input.. Chris

 

Good idea. I took another approach and push a thin coat of clear epoxy over the repair as well as the traces on the edge of the board.

 

This is exactly the problem I am having. I will see what I can do about it this weekend. My back is really starting to hurt! Thanks for the advice.