Third-party wiring diagrams are wrong for the Giulietta (especially the reverse lights and boot harness).
Here are some recommended eLearning resources to help you learn more about the Alfa Romeo Giulietta: elearn alfa romeo giulietta better
Many Giulietta owners leave the settings exactly as they were on the showroom floor. You don't have to. The Uconnect system allows for deep customization if you know where to look. Third-party wiring diagrams are wrong for the Giulietta