Audi A4 B9 Interior Lighting Retrofit. Get the C class. PIN 3 from Auto Hold on connector A black interior middle one at PIN 17.
A4 B9 Platform Discussion - Retrofitted. Pleasant and discreet light in the interior. Ambient lightning Just like the Extended LED Interior Lighting Pack - TLDR.
Pin 4 of Auto Hold is connected to the wire white-red corresponding to PIN 5 or 7 of the handbrake button.
In addition to the LED Interior Lighting Pack includes coloured ambient lighting in the following areas. Adjustable brightness and colors. Cable set illuminated cupholder for Audi A4. Retrofit interior lighting for the footwell or for the ceiling as a reading light.