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believe to have solved it
as i started this thread just wanted to close it as well. It's not a coding issue. I have B/T, cleared the footwell module again, and also found the reset option last night. No change though
However found the solenoid return pin goes to 0V during high beam on the S10003, but stays at 12V on the S10004. And found an (audi) thread where an owner with the same bi-xenon shutter system found a solenoid wire that had been cleanly cut. He presumed by the Audi dealer while that headlight was repaired while being on holiday. That got me thinking.
So disconnected the wiring on the solenoid side, and hooked the solenoid up with temporary cables to the (green)12V high beam wire going into the ballast, and to ground. And all works.
I thus suspect replacing a S10003 with S10004 requires only a minor wiring change, but dealer sees probably a lot more margin potential in it.
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