this seems to sound like an option in VAGCOM
3.12 DaytimeRunningLights(DRL)
Component: BCM PQ25 (09 - Cent. Elect.)
Byte: 23
Bit: 6
Purpose: Switches on the low beam as soon as the ignition is turned on. This way low beams are always active. The rear lights, city lights and dash lights will NOT come on. Unless you have a Light switch with 'auto'- option and it gets dark enough
so can also be turned off