Hey, I had similar problems with my 2014 Toyota Prius+. The error display also came on for me and said seat module defective. I have to admit, it was a serious problem. The mechanic had to replace the module completely as it couldn't just be repaired. He also said that the seat sensors and cables were routed properly to prevent a recurring problem. Honestly, I was pleased with the garage's work. They really took their time to figure out the issue. So, I would recommend you get the diagnosis of your car confirmed and then get the module replaced urgently. Good luck with that, buddy!

(Translated from German)

Hey, thanks for the tip. That sounds like quite a job with this seat module. Do you remember what you had to pay for the repair back then? Has anything else come up since the replacement? I'm really grateful for any tips before I head back to the workshop. Thank you!

(Translated from German)

Hey, sure, I can tell you! I had to pay €435 to replace and set up the broken seat module. It wasn't exactly a bargain, but since the replacement everything has been working perfectly again. No more malfunctions with the electric seats. I think it's definitely worth checking before you ignore something bigger. So take it to the workshop and have it checked! Don't worry, you'll manage!

(Translated from German)

Thank you, that really helps me. It's a good point of reference before I go to the garage. 435€ is not a lot, but if it helps to get the electric seats working again, then it's worth it. Better safe than sorry, right? I think I'll have the seat module replaced and then hopefully my car will run smoothly again. Thanks again for your help buddy!

(Translated from German)