This is actually on my RS3 - but it is the same unit so I thought I'd post here as chances are someones had it off on their A3/S3 also. Doing a project so had the interior light out and it seems there is a small blue button next to the SOS/Emergency button in the interior light unit at the front. Does anyone know what this does? Don't want to press it incase it does something terminal with it being close to the SOS button.