Rear Fog Light Warning Icon
Audi A4 B6 and B7 Headlight Switches have the Rear Fog Light Warning LED active, unlike the VW Headlight Switch.
The Audi A4 also has two different style switches - one has an extra "AUTO" position and the other has the "Lowline" three position Headlight Switch as per the Mk IV / 6R Polo.
These switches all still use the Mark IV / 6R Polo style Headlight Switch with the larger body.
However, the internal camshaft that controls the electrical outputs as the Switch is rotated to different positions is completely different and will not work with the .:R32 wiring.
We are still interested in the 'Lowline" Switch however, as you can, in fact, swap the printed circuit board into a VW Headlight switch to obtain the extra Rear Fog Light Warning LED.
I secured a secondhand Audi Switch to obtain the required circuit board.
Naturally, you need to also select the Switch version to match your existing Switch with either Front & Rear Fog Light positions or only the Rear Fog Light position.