What does the Headlight adjustment switch do that is right beside the bootswitch (not on us models). It has 0,1,2,3.

 

It adjusts the height settings of the headlights.

If you load the boot (trunk), the headligut alignment is too high and can blind incoming traffic. So you turn it a noch downwards.

 

Damn. Can you put that system to a US car? Just plug and play with the switch?

 

Did it on my 01 XJR but its quit a lot more than plug&play
Obviously you need the switch
Then the wiring for it stop at the driver side A pillar electrical connector
You need to use pins on the outside of the connector to extend the wiring to the headlamps
You then need to get the electrical headlamp adjusters and modify the headlamps base/surround to make them fit and also make a all the electrical connections
Not that hard if you know what you are doing