Hi all,

Fabia MK1 VRS, so electric front windows only. Right hand drive. Some time back the windows would intermittently, when controlled from drivers side. Eventually they packed up altogether. I followed the various threads on the subject on this forum, and thought the problem was with the PCB in the driver's window motor/controller. No broken wires near A pillar. The passenger side would operate if battery was disconnected/reconnected for a while and then stop. The drivers side did nothing. So took drivers motor out and looked at the PCB. Changed the capacitor but it did no good. Then some more reading and read Breezy Pete's thread about the resonator on the PCB. I looked at the LIN output and had no waveform, the signal was stuck at 12V. I heated the PCB around the resonator and found the LIN was operating, at least I could see a signal going low occasionally. Great, so I've fixed it. Back in car still no window operation from driver's switch (pass or drivers window), but passenger door switch operates pass window. Something it didn't do before. LIN working OK. FYI the interior light comes on when opening driver's or passenger door. The drivers side window switch changes the voltage on the wires on the controller connector, so I think I can rule out the switch. The passenger window operates from the passenger switch, but still no operation on either windows from the drivers side. Does this sound like the relay on the PCB is also faulty? I tested the coils and they both clicked. Is there any other connection to the PCB that could stop the drivers side from operating?

Number on motor 6Y29590802 and SK240DDRS.

Replace the resonator, not the relay.

Isn't the fact that the LIN is working a sign that the (possible) dry joint on the resonator is fixed? Not trying to tell you, I know you have spent many hours investigating these issues. I am just interested. Replacing the surface mount resonator is beyond my soldering skills, the capacitor was hard enough! It appears the LIN now gets to the passenger door to allow local control of the passenger window. I assume the resonator produces a clock to the microcontroller. What other signs of poor resonator can I check for?

Something that works briefly after an intervention such as a blast of heat doesn't necessarily demonstrate something that will keep working.

Passenger window will work independently from its own switch for a short time after each time it's powered up/reconnected.

Not evidence of comms from driver's module.

Edited 26 October, 202526 Oct by Breezy_Pete

The passenger side has not been disconnected. Prior to me reflowing the drivers PCB, the passenger window only operated for a while after the battery was reconnected. Now the LIN is working, the passenger side works from it's switch indefinitely. Just no operation on driver's side.

Hmm.

Check fuse 11 if you haven't already.

And test convenience opening/closing via key in driver's door lock.

Something doesn't stack up here.

Fuse 11 ok. Bit of a problem with door lock. Not able to turn lock with key. Seems to be locked up. Previous owner used fob to lock. Tried to get lock out to soak in wd40 but lock is also stuck. Left lock soaking. So do you think convenience module could be involved?

Convenience module totally uninvolved, in any active sense.

What year is the car?

I'm unconvinced that your driver's side module is working at all, but I may be misremembering whether or not passenger module can work from its own switch regardless.

How far are you from Highworth/Swindon?

Portsmouth. Petty sure before I reflowed the PCB, neither door worked off their own switches. Only the passenger door would work for a short time after reconnecting battery. Now LIN is working and passenger window works indefinitely from it's switch.

2007 MK1 Fabia

Passenger side not working from driver's door control though?

If driver's module (and its switchpack) was alive, but a problem with its relay, it would still be able to work the passenger window.

Agreed.

I can send you a working driver's side module as an experiment, subject to a suitable, returnable deposit.

Thanks Pete. Will do a bit more experimenting here first

Had a thought. What if the LIN isn't working as it should, but the activity is enough for the passenger door module to allow local control. The LIN is normally 12V, but does go low. The messages from the master in driver's door probably tell the slave to go up or down. But if the LIN is corrupted the slave would ignore.

Maybe.

Or your board heating has unintentionally moved one or more components, causing normal inputs to no longer work within driver's side module.

Edited 27 October, 202527 Oct by Breezy_Pete

I sent my window controller off to BreezyPete on an exchange basis. His repaired one had my windows working again. I had my deposit paid to my account a few days after sending him my unit. Many thanks Pete.