MOST Bus Fault

Good day. The situation you delineate regarding the MOST bus failure in your Fiat Croma is indeed indicative of a potential issue within the optical fiber network connecting the vehicle's infotainment control units. While it is plausible that a defective control unit precipitates this malfunction, a preliminary diagnostic assessment should encompass a thorough inspection of the optical fiber cables and connectors. Erroneous connections or compromised cabling can readily engender similar symptoms. Have you, by any chance, inspected the physical integrity of these components? Furthermore, could you furnish details regarding any recent modifications or interventions involving the vehicle's electrical system?

Thanks for the detailed response. I haven't checked the physical connections yet. To be honest, I'm not entirely sure where to find all the relevant fiber optic cables and connectors. Are there any specific locations I should focus on, or is it best left to a professional? I also didn't modify anything recently.

Given your level of familiarity with automotive electronics, it would be prudent to refrain from independently manipulating the optical fiber network. Erroneous handling could potentially exacerbate the issue or induce consequential damage to the delicate components. I suggest seeking counsel from a qualified automotive technician proficient in diagnosing and rectifying MOST bus-related faults. While the resolution might entail a financial investment, a meticulous diagnostic procedure conducted by an experienced professional will undoubtedly prove invaluable, especially considering the intricacies of contemporary automotive electronic architectures. The estimated expenditure for such repairs frequently approaches 1000€.

Thanks a lot for the advice! I took it to a workshop, and they confirmed it was a faulty control unit on the MOST bus, just as suspected. The repair cost was indeed around 1000€. Appreciate your help!