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If I adjust it with an Allen key, don't the cars fitted with xenons have the self levelling adjusters? So they will revert back to the original setting.
Nope, the self adjusting is only to compensate for increased load on the front or rear axle, they actually don´t know where the "basic" setting is, that's for the mechanic (or you) to decide
But do you actually have to use vag com to set it, or can I just go out now and lift my bonnet and turn it?
if i adjust it with an allen key, don't the cars fitted with xenons have the self levelling adjusters? So they will revert back to the original setting.
http://wiki.ross-tech.com/wiki/index.php/VW_Golf_(1K)_Headlight_Aim_Control_(Xenon_with_AFS)
This says you should acknowledge the base setting as the guy above said!
OK, go for it and let us know if you think it's possible/worth doing. I may plug in tomorrow and try this.
I've adjusted mine 3 half turns up from stock on both headlights. I parked it with the beams exactly on a line on a brick wall, adjusted them up 3 half turns. Then switched them off and key out and on again and they homed in at my new setting every time. I have checked the auto leveling by sitting in the boot and it works as I would expect. If I do a scan I get no faults.
I also did this on my Exeo with factory xenons as I found they were low too.
No messing with Vagcom, just use the headlight adjusters. The adjustment is very sensitive though, try it in half turns so you aren't blinding people.