I'm in the process of converting my 2003 Mégane from halogen to xenon headlights. I already have the obvious parts (headlights and ballasts) installed and working, but will still have to add some parts to get the (automatic) levelling system working.

Besides axle height sensors, I need to add three extra wires to the existing wiring loom for the following functions:
- speed signal
- height signal
- diagnostic signal

I have the original Renault wiring diagram for the xenon-equipped version where I can see where these three wires are connected. The only problem is that the components in the diagram are only marked by numbers, and I'm missing the conversion list describing which component each number represents. I could naturally reverse-engineer my way back to the right connection points with enough dismantling and measuring, but knowing the right 'spots' beforehand would speed up the process drastically.

So if any of you here has access to that information, I'd be very thankful if you could tell me what the following components are:
- #225 (the diagnostic line goes to this component)
- #118 (=CTFDR/ABS=???, probably the wheel sensor?)
- #1094 (=SCTFDR/ABS=???, what's this then?)
- #1337 (the UCH??? or the UPC???)
- #1373 (front axle height sensor???)

And as for the headlights: #226 is the left one and #227 the right one? Or vice versa?

Cracked it myself in the end.... Carefully reading through the (troubleshooting) manual sometimes helps! ;) Here are the components in case someone's interested:

225 = Diagnostic socket in the centre console
1094 = ESP control unit
118 = ABS control unit
1337 = UPC unit
1373 = axle sensor

And here are the pins you need to connect:
Headlight Pin 2 -> Diagnostic socket Pin 7
Headlight Pin 6 -> Axle sensor Pin 4
Headlight Pin 7 -> ESP unit Pin 33 + ABS unit Pin 23

The pins 33 and 23 of ESP+ABS should already be connected together from the factory, so obviously you only need to hook up the headlight to one of those pins or wires.