El mmi enciende y al poco se reinici lo hace como 4 o 5 vece4s y luego se queda la pantalla negra y en el cuadro de instrumentos pone el mmi esta apagdo actualmente no es posible manejarlo, con ello con lleva que me quedo sin radio,musica, bluethoo gps y el menu de mi audi

my auxiliary doesnt even show up on the car
one mechanic told me that maybe there is a cable that somehow disconnected or i need a new navigation system

I have just got my car back from the garage and all the eceltrics have been disconnected and reconnected. It is asking for a 4 figure code for the radio/cd/sat nav. I have the code but can't find out how to enter the code. There is nothing in the "Audi Navigation System Plus" Operating Insructions that I can see.