I am not sure if I can be of much help but I have recently fitted a pair of LED tail lights to my Jetta GLi (2007) however this is the MKV cecm. My factory coding was
17 07 8E 23 40 04 15 00 07 14 00 00 00 14 00 00 00 28 77 0B 5C
I changed this to
07 07 8E 27 00 04 18 00 00 0A 00 00 0F 00 00 00 00 28 5D 03 5C
Unfortunately I don't have access to the car otherwise I would check the long coding helper for you.
http://forums.vwvortex.com/showthread.php?2289904
Tim Birney has been really helpful on there with fixing issues people have had with LED lights..
17 07 8E 23 40 04 15 00 07 14 00 00 00 14 00 00 00 28 77 0B 5C
I changed this to
07 07 8E 27 00 04 18 00 00 0A 00 00 0F 00 00 00 00 28 5D 03 5C
Unfortunately I don't have access to the car otherwise I would check the long coding helper for you.
http://forums.vwvortex.com/showthread.php?2289904
Tim Birney has been really helpful on there with fixing issues people have had with LED lights..