RSQ3 Power Windows Dead, Control Module Issues

I had a similar issue on my 2021 RS3 and have some experience with car electronics repairs. The power window system completely failed across all door panels. After basic troubleshooting attempts like battery disconnect failed, I took it to a workshop. The root cause ended up being a depleted vehicle battery that was causing electronic system malfunctions. The old battery wasnt providing enough consistent power to the window regulators and other electrical components. The repair cost me 290 Euro for a new battery plus installation and system reinitialization. After the battery replacement, they had to perform a complete reset of the power window system. All window regulators needed to be reinitialized to restore proper functionality. What is the age of your current battery? These symptoms often point to battery issues, especially if multiple electrical systems are affected simultaneously. Could you also share: Does the central locking system work normally? Are there any other electrical issues present? Have you noticed slower engine cranking recently? This information would help determine if your issue matches what I experienced or if its potentially a different root cause.

Thanks for sharing your experience. My battery is actually only 6 months old since its a new car with 17957 KM. The central locking works fine and I have no other electrical issues at all. The window motor functions seem to be the only problem, with complete failure across all door panels. After reading your reply, I did a more thorough window reset procedure, holding the switches in specific positions, but the window troubleshooting was unsuccessful. The strange part is how all windows failed simultaneously, which seems to point to a central electronic control issue rather than individual window motors. I will try to get it diagnosed at a workshop since it seems more complex than initially thought.

Based on your description of simultaneous window failure with a relatively new battery, this does sound different from my previous battery-related issue. After dealing with the earlier problem on my RS3, I actually encountered another window system failure a few months later that matches your symptoms more closely. In my case, the root cause turned out to be a faulty door control module in the driver door panel. When this central module fails, it can disable the entire power window system since it controls all window switch inputs. The workshop found that moisture had damaged the control unit circuitry. The repair involved: Replacing the driver door control module (480 Euro), Window regulator initialization procedure, Full system diagnostic reset Key indicators that pointed to the control module: All windows stopped simultaneously, Other car electronics working normally, New battery ruling out power issues, Window switch inputs unresponsive across all doors Since your symptoms align with this scenario, I recommend having the door control module checked first during diagnostics. The simultaneous failure of all window controls typically indicates a central control issue rather than individual window regulator problems.

Thanks for the detailed follow-up about the door control module issue. This helps narrow down my problem significantly since the symptoms match exactly, especially the part about all windows failing at once while other electrical systems work fine. Based on your experience, I will specifically request the workshop to check the driver door control module during diagnostics. The car electronics troubleshooting seems to point in that direction, especially since my window troubleshooting attempts with reset procedures were unsuccessful. The 480 Euro repair cost you mentioned gives me a good baseline for what to expect. Its reassuring to know this is likely a single component failure rather than multiple window motors or regulators needing replacement. Will schedule a workshop visit this week to get the window controls checked and hopefully resolve this issue once and for all.