AudiForums A4 Series. A4/A4 cabriolet/S4 (B6 chassis) . Rolling Thunder However, Not only do I have the demister not working, but the passenger side only blows out freezing cold air, whatever temperature you Checkthe J9 relay as if this fails the heated screen will not work. its in the panel in the boot you have 3 relays on the bottom left its the nearest left relay. Audi A4 - B5 Forum - 1995 - 2002; Audi A4 - B6 Forum - 2002 Howto diagnose and fix Audi A6 C7 MMI display issues/ infotaintment screen not working/ MMI screen blank display/ MMI screen issues?we have a 2012 Audi A6 C Allother electrics work, both keys lock and unlock, indicators work, headlights etc. Before sending the clocks off I did the usual checks: Checked dash fuses . Engine fuses . Checked battery . Tried another battery . Had the battery tested by tyre centre and was told it was good, no dead cells. Factoryfitted AUX input not working. Thread starter infernox; Start date Jan 29, 2014; Forums. then do a reset by holding radio & setup button until the screen goes dark & unit power resets, this can take 30 seconds sometimes. DIY: Concert 3 to RNS-E Retrofit - 2012 Audi A3 - Audi Forum - Audi Forums for the A4, S4, TT, A3, A6 Sowhen you set the digital setting it remains until you change it. I find that the digital speedometer to be an important display given how useless the 0-180 mph gauge is on the analog speedometer. The analog speedometer is too difficult to easily read at low city driving speeds. Audi should reconfigure its analog speedometer for real drivers. AudiMMI display not working sometimes. 2011 Audi A4 P+ white with black exterior with sports package, nav and ~500 miles . on 10 Aug it was pretty hot/sunny in Colorado. Got in the car after work (car sits outside all day) and the Audi MMI screen was non-functional (no display at all no display for nav, satellite radio, car/setup a34xPQ.