try this
http://www.mk5golfgti.co.uk/forum/index.php/topic,16607.0.html
Using that link, it says:
Extra info:
The Skyline effect will only operate correctly if the user is already wired and coded for AMBER Operation.
The outer Ring of the fender mounted Tails is lit, and the center section is dark, BYTE 09 = Hex 00, or 0% power, and it goes to 100% Power when the brakes are applied. The Center Section, Brake Light as a Tail Light is PIN 4 of the Tail Light Connector, Black/Red on the Driver’s side, and Black/Violet on the Passenger side.
If you double tap onto these wires, and you want the trunk mounted LEDs to light up as Tail Lights, then the Center Ring will have to stay at HEX 0A, or 10% power which will kill the Skyline Tail Light effect.
For the SkyLine effect
The desired choice is to tap into the Outer Ring of Red LEDs on the fender mounted tails, PIN 2 of the Tail Light connector, Gray/Black* on the Driver’s side, and Gray/Yellow* on the Passenger side. Combine this suggestion with a code of HEX 00 for BYTE 09, and the outer ring of RED LEDs on the fender mounted LEDs will light up as driving Lights, and the “ghost” ring of your modified tails will light up giving you the O\o----o/O look that defines the SkyLine Tail."
I need to work out what all this means but if your like me your now saying wow that looks cool but can I do it.......
I wonder if messing with the coding will make it brighter....