Audi MMI Not working. As useful as Audi MMI can be, it is not faultless. At times, Audi MMI can malfunction and stop working. The causes of MMI breaking down are varied and include amplifier, modules, or fuses malfunctioning. Knowing how to properly check on them as well as proper replacement is key to keeping our Audi MMI safe from serious If you have vagcom, you can diagnose the problem. If you have sound, the problem can be the screen. If you dont have sound, the problem can be Gateway. If you dont give a code your new battery, it work but it is advisable code so that sistem knows that it has a new battety and what battery. The MMI is dead on my Audi a6 c6. I've done an optical bus diagnostic and this is what I get. Electrical Optical 19 Can Gateway OK ERROR 5F-Information OK OK 0E Media Player 1 OK OK 56 Radio ERROR ERROR Thanks in advance 1 First Name: Farzad Location: Portsmouth Audi Model:: A6 3.0 DTI Audi Year: 2011 Posted February 23 I have A6 3.0 DTI Avante 2011. Last week I noticed for first time a message on my dash board.."Key weak battery". After that the MMI displayed started having mind of its own, coming on and off when it wanted. A6 C6 3.0 Quattro le mans , was wondering any help my MMI stopped working 2 days after buying car screen lights up for about 40secs then turns of I have no fiber optic light going to nothing at the back of car and there dosnt seem to be any power at the control unit at the gear stick any help would be great. I'm havering trouble with my 06 a6 MMI it shuts off when the radio is on and loud an when I'm driving makes a clicking noise in the under the dashboard .

audi a6 c6 mmi not working