Hi Paul
I know nothing about Aero S5 and this may be stupid suggestion, but on my 4/4 there is a dash board light dimmer provided. It is a horizontal roller type control which I always leave set to maximum. I must have accidently caught it one day during the daylight time and dimmed the dash board lights to the point where they where off completely. The next time I came to drive the car in the dark I had no dash board lights. I half dismantled the dash board before I realised the the control was turned right down.
Regards Tony
