Diagnosing Faulty Rear Blinds
 

Hi folks,

Recently bought a D3 A8 that has electric blinds on the back doors but both are entirely unresponsive... Read that pulling and holding the window switch for the door also activates them and again unresponsive so not sure if this implies a motor issue rather than switch?

Any advice on how to diagnose would be appreciated, clearly not a must have item but working my way through a few issues and would like to get everything working.

Cheers,
Chris

Hi Chris,

There are two ways of operating the side blinds - the roof console above the rear seats and the window switches.

If neither are working, it's unlikely to be the switch (especially if the window switches still work to operate the windows).

Do you have access to a scan tool to scan for errors?

Yes tried both and no response at all from either.

Psyche from this forum has kindly offered to run a scan (other issue) so maybe that will shed some light, assuming checking voltage at the motor when activating the switch to check for increase would help diagnose...

Cheers,
Chris

How are they fused?

Hmm....good question..... Does seem like the circuit isn't completing due to the complete lack of any noise....

Any one know if there is a fuse specific to them?

For clarity the rear electric blind and rear electric windows all work fine....

Cheers,
Chris

Check the manual, I don't have a D3 any more but you will find a fuse diagram/table and that would be my first point of call +++

There's a thermo-fuse for each rear door wiring harness. So if the rear windows move down then the fuses are good. Each blind motor is connected to its door control module (there's a control module in each door). The door control module will activate the blind motor if it receives an input command, either from the switch on the door or via CAN from the roof module.

Have you been using the rear door button to move the window up / down? If yes then the button is good, and we already know the fuse is good.

Odd that both sides don't work and the roof button does nothing. It's probably a coding issue with each door module, or very unlucky that both right and left blind motors have failed.

Once Psyche scans your car we'll know more.

So, went out and had a play around to check a few things;

- rear windows work from switches on rear doors
- rear roof panel buttons work for lights and back window blind
- pressing side blinds button on roof panel or holding rear window close on drivers contrails has no visible or audible effect, no clicking, whirring or to my eye dimming of lights....

I got a scan done a few weeks ago (only have paper copy or I'd paste it) and nothing I can see....address 62 and 72 for rear left and right doors both listed as "no fault code found"....

Appreciate all the input so far, got a few different little "foibles" so may be looking for further support in near future!

Cheers,
Chris

Can you post the coding values for the rear doors.

Total newbie on all of this so might be wrong thing but the value against "coding" for both doors is 0032623....

Thanks again for taking the time!