Daytime running lights behaviour: Daytime running lights (DRLs) behave differently in different markets, for example the front LED light strips that accompany Xenon lights turn off or dim in some markets when blinking/signalling. Aerodave on A5OC.com has researched this and posted his experiences here:
http://www.a5oc.com/forums/showthread.php/have-solved-drl-2468/index.html. In short, he reports that changing Central Electronics 09, Submodule 0 (Master Cent. Elec. box, rather than a slave module), Byte 3 (fourth from the left), Bit 7 (first bit from the left in the binary representation, bottom check box in the VAG-COM long coding helper) is the key. If set to 1, setting it to 0 makes the DRLs stay on when signalling. Thanks to Aerodave and please see the full thread for more!
Aerodave - thanks! - sent this great list of additional bits you can toggle and turn to change the DRL behaviour.
For submodule 0:
Byte 02
bit 0 -
bit 1 - front side markers as DRL
bit 2 - headlights as DRL
bit 3 - fog lights as DRL
bit 4 - LED strip as DRL
bit 5 -
bit 6 - side markers as DRL
bit 7 - tail lights as DRL
Byte 03
bit 0 -
bit 1 -
bit 2 - LEDs remain at full brightness with parking lights
bit 3 -
bit 4 - Turns off DRLs when checked
bit 5 -
bit 6 -
bit 7 - Turn off LED-strip DRL with turn signal (dim LED if front side marker also selected as DRL)
Byte 10
bit 3 - Set to 0 to disable amber side markers (U.S. vehicles)
See also:
http://www.a5oc.com/forums/showthread.php/some-new-lighting-3490/index.html
Apparently Ross-Tech have added long coding helper labels for A5 Central Electronics module in later versions of their VAG-COM/VCDS software. The downside of this seems to be that you can not easily edit bits unknown to the software, like the bits controlling some aspects of day-time running light behaviour (previously they just had checkboxes without labels for easy changing). If you need to change these bits using VAG-COM and you can't see the easy checkboxes in your version, you need to edit either the module coding binary representation or the bytes manually. Aerodave reporrts here
http://www.a5oc.com/forums/showthread.php/help-vagcom-3585/index.html?p=39477 that you also need to hit tab, up or down after entering bits or byte manually in order to save them before exiting the long coding helper.
If you choose to edit individual bytes, some instructions: When you need to change, say, bit 1 in Central Electronics submodule 0 byte 02 (front side markers as DRL) make note of the value displayed for byte 02 currently in the long coding helper. It is a byte displayed in hexadecimal numbers, ranging from 00 to FF (that is 0 to 255 in "regular" numbers, hex values just use letters A to F in addition to numbers). You will need to take the hex value of byte 02, convert it to binary representation, i.e. bit form (a byte consists of eight bits so the resulting "bit form" would be something like 10010001, eight zeros or ones), change the bit you want to change, and convert the bits back to a hex value that you can enter to the VAG-COM software in place of the old hex value.
I will try this next time I connect vcdc to my car. But are there any place to se how I do long coding? I have to admit I don't know how to do it without the long coding helper 
