Optical bus errors in the 2006 Audi A6 Quattro typically indicate wiring or connector faults between control modules like the MMI, telephone, and sound system. Start by inspecting the fiber optic cables behind the dashboard and center console for damage or loose connections. I start digging for a solution: all fuse are good, check with vag-com this is what I've got: Today, I drop the glove box to see if everything was fine around the gateway and the control head and I remove the amp and all the support that hold the radio and the navigation dvd to check if everything. Why is the Audi A6 C6 MMI screen black and the buttons unresponsive, with multiple controller communication errors, and where should I check first? The MMI is most likely down because the MOST optical bus is interrupted, so start by isolating the loop with the fiber bridge plugs and checking the. finally, the MMI stopped working with an optical bus short circuit code. I didn't have VCDS so I couldn't run the optical bus diagnostic. But I started to take out devices with a fiber loopback plug and (relatively) quickly discovered that the SiriusXM radio unit was the problem (and I've never had. On the Audi A6 C7 (2011–2018), the MMI (Multi Media Interface) can start rebooting randomly even though the car drives perfectly. Owners often blame the MMI “head unit” immediately, but in many cases the real culprit is the MOST bus: the fibre‑optic network that links key audio/infotainment modules. I was recently surprised with an Audi A6 from 2006, and I was told that the Screen in the car hasn't been working for a while now. I've been doing my research and it seems that it's a pretty common issue, but for everyone else their screen comes on showing the Audi logo and shuts off after a few. Hello, I have problem with my MMI system. My MMI sometimes work very slowly, sometimes sound gone, stuck or reloading. My navigation unit was draining the battery, so I take.
