What changes
Module 09 (central electrics (BCM)): adaptation channel 04 = 1000 (ms).
Details
Audi A3 8P (2003–2013). A factory headlamp washer is required. The value is in milliseconds; usually a few hundred — check “before”. The channel comes from public 8P adaptation descriptions and has not been verified by writing to a car. Odyx reads the current channel value first and shows the changes: on other module versions the channel number may mean something else — compare the “before” value with what you expect. You need an ELM327 adapter that supports TP2.0. Undo — from the write history.
Other options
This is one option of the “Headlamp washer duration” setting: only one can be active.