I'll get a photo of both sides up shortly.
Thank you both for your help!

 

 

All LEDs working again! But a slightly crude way of getting there..

I soldered the varistor back on to the board, and decided that it must be a break on the board somewhere that was causing the issue. So my first simple idea was to plug the board back in, switch the engine on, activate all switches then give the board some very light twisting to see if a broken connection might temporarily pick back up...

Well stupidly I did this with a screwdriver in hand and managed to bridge across two contacts on the board :/ .. with a bang, some sparks and a terrible smell of burning all the electrics in the car failed! So one by one I replaced the fuses that I managed to blow (6 in the end?!).

Then I thought I'd go back to the board to try another method and low and behold the LEDs are working!

My initial thought was that there must have been a blown fuse all along, however after every fuse I replaced I would try to turn the engine over but there was no power to the starter motor. Until the very last replacement and I had ignition - so if the fuse was originally broken then I wouldn't have had ignition?

The last fuse to be replaced was driver side box, number 8 (console switch pack & ignition +ve).

So after all of this I'm none the wiser to what actually caused the problem in the first place. But on the plus side I am now more familiar with how it all works! Every cloud eh?

Thank you both for all your help along the way, very much appreciated!

 

i have a same thing my switch control buttons on my jaguar xk8 2005 , all functions working great , 1 button only the small red led not work

 

 

LED wire polarity maters . You can find low current push buttons on Ebay but you would need the thickness dimension as well as the pin spread dimension .

 

yes function working , just the led light not working, maybe need to replace with new led ?