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The DNA system found in the Alfa Romeo Giulietta is highly advanced and can face various potential malfunctions. While generally dependable, this system depends on the proper functioning of the computer, sensors, and switches. If any of these components fails or if there is damage to the wiring, the system will not function correctly. I recommend taking the vehicle to an auto shop and having them use a diagnostic scan tool on the OBD-II port to identify the problem. Without a thorough diagnostic assessment, it would be challenging to locate and fix the issue. Many repair shops offer diagnostic tests either for free or for a small fee.
If there's an issue with the Alfa Romeo Giulietta DNA system, you may need to restart the head unit.