Here is the write up for the tweaks. Keep in mind that the following directions were created by using OBDEleven. The tweaks can also be done with VCDS, with some of the names being slightly different. Google Translate is your friend. These tweaks are only applicable to the facelift cars '18+ with the LED headlights. The tweaks have been tested on a '19 GTI SE and two '19 Alltrack SEL's. Please post your results after making the tweaks so we can compare any differences between years and models.
Warnings:
1: Make a backup of the Multifunction Module 4B.
2: Make sure that your car is parked on a flat and level surface with the steering wheel completely straight.
3: Pay close attention to the channel names. The names are case sensitive and punctuation sensitive. There are multiple names that are very close to each other. Any changes other than the ones listed may have unintended results.
4: After making the changes, run the two settings adaptations listed. Only run those two.
5:
DO NOT CHANGE THE REGION SETTING! On previous cars this worked, but on the facelift models it doesn't. Changing this caused all sorts of errors, everything from front turn signals to communication and more.
Steps:
1: Turn on the car, but do not start it
2: Enter the Multifunction Module 4B
3: Make a backup of the coding
4: Enter the Long Coding section
5: Change the following entries to the following values:
Headlight Regulation > not enabled
Dynamical_Low_Beam_Light > enabled
rain_light > enabled
highway_light > enabled
All-weather lights > enabled
6: Apply the changes. In OBDEleven press and hold the check mark. You should get a message stating that the changes were accepted.
7: You will get multiple errors displayed on the dashboard. That's expected and they will be resolved next.
8: Exit the Long Coding section
9: Enter the Basic Settings section
10: Select Basic headlamp setting. Then run the setting by pressing and holding the check mark. You should get a message saying that the setting has started.
11: Go back to the list of settings
12: Select Acknowledge basic setting. Then press and hold the check mark to run the acknowledgement
13: Exit out of the Basic Settings section.
14: Start the car. The lights should perform their normal adjustment and self-check when the car is started.
Results:
I noticed that the headlights were faster to respond to steering input and their movement range has increased. Both the low's and high's were more responsive. The delay and smoothing factors that were being applied are gone now. This happens at low speeds, highway speeds, and interstate speeds.
I noticed a small difference in the visibility when driving at night in the rain. Things appeared to be illuminated slightly better. Almost like the beam pattern was evened out.
Some people may not like how fast the lights move after this. There is a way to get an in-between setting, about halfway between the before and after tweak speeds. Let me know if you want that setting too.
If you're interested, please give the tweaks a thorough test and let me know what you find. I'd like to get as much data on this as possible. Hopefully you notice the same things that I did.
One last thing to note:
There are lots of options under the Long Coding section that pertain to the additional functions that the DLA headlights support. Unfortunately we don't get those as a factory option in the US. A retrofit may be possible, but it would really depend on how the headlight connectors are wired. The options for the different functions are all in there, along with several things labelled with Matrix Headlights.