S80: Electrical 2009 Volvo S80 DTC U0231 and B1131

[Goc5]

Hi. My 2009 Volvo s80 has the two error codes listed in the title.

This has lead to me not having operational wipers. Initially they wouldn't turn off, and would also activate randomly, ignoring any input from me.

This eventually lead to them staying active when I had the key removed from the car, so I had to remove the fuse itself to get them to stop.

Since that they haven't worked at all, and I can't clear those two codes. I've tried replacing the wiper motor, wiper stalk, checked all fuses, checked the connectors on the ECU to see if there's any corrosion, etc. All of this has lead to nothing, I'm out of ideas.

The code u0231 says: data bus, rain sensor control module - no communication.

The code B1131 says: Wiper Motor Module. Bus Signal/Message Failures. Missing Message

I've searched this forum and others and seen other people suffer from this issue, but I haven't found one concrete solution that works, people either stop replying to the topic or fix it with something like a motor replacement, which doesn't work for me.

Any help is greatly appreciated as I live in a country that has rain 99% the time