This has the fibre optic connection with the 12pin connection, as it is controlled from the Audio Gateway (AWG). The AGW (Audio Gateway) is a central component in the audio and infotainment system of many Mercedes-Benz vehicles, including the W211 E-Class (2002–2009). It's an essential part of the fiber-optic MOST bus network, and it's responsible for routing and managing audio signals across all the multimedia modules.

This is not an easy installation and does require professional attention.