I have an A3 8P Cabriolet and the roof will not work because the O/S rear window will not lower.
It won't work from the door switches nor the roof control system.

At first this was an intermittent problem but now it has failed completely.
Any suggestions on what might be causing this, before I start pulling apart the trim panels to get to the window mechanism?
Are there any guides on how to remove the trim?

Also, I have tried a generic OBD scanner and it show no fault codes. Can anyone recommend a reasonably priced scanner that will recognise the Audi specific fault codes?

Thanks for any help.