Cima passenger seat issue

Before you dive too deep, have you checked the battery's health? A heavily discharged or defective battery can cause all sorts of weird electrical gremlins in modern cars. The Cima's system might be cutting power to less essential functions to conserve juice. Is the car cranking strong?

I hadn't considered the main battery since the car starts and drives fine, but sometimes it cranks a little slower than I'd expect. If the battery is the issue, why would it only affect the passenger seat and not the driver's side, or other electrical components?

Since it cranks a bit slower you probably have found the culprit. Some systems are more sensitive to voltage drops than others. The passenger seat module might have a lower voltage tolerance, or the wiring run to it could be slightly weaker, causing it to fail first. It's also possible the driver's seat was used more recently and is still holding some charge. Really, it's time to get the battery load tested and if that's ok, get the codes read properly using a Nissan diagnostic tool. That'll tell you exactly where to dig next. Looks like you need to visit the workshop.

I booked it into a local garage, and you were spot on – the battery was the problem! Apparently, it was heavily discharged. After replacing it and clearing the error codes, the seat's working perfectly again. The whole thing cost me 290€, which I consider a bargain compared to replacing the seat motor. Appreciate the help!