Evening all.

I have recently obtained a set of oem xenon headlight units to go on my brothers octavia elegance.

It already has the washers which is a good start.

What else will I need to wire them in?

I've done a search and you can add a wire so the dipped beam stays on when you use the main beam.

Any ideas on where to wire it? As my brother would like this.

I've also read that someone wired the levelling motor to the switch, so removed the need for the auto leveller.

Does anyone have any photos?

I did this with my Octavia Elegance, but used an aftermarket HID kit as I bought bare OEM xenons without the ballasts and bulbs.

 

To get the dipped beam to stay on with main beam you need to connect a cable from pin 8 on the back of the head light switch to the yellow and green wire at the fuse box. This is how a Golf Mk4 would be wired from the factory as they have separate dipped and main beam bulbs as standard.

I didn't get the levelling motors in the xenon lamps to work as they are 4 wire rather than 3 in the halogen lamps, so I made new mounts and fitted the halogen motors to the xenon lamps so that I could use the switch on the dash.

Perfect thank you. Other than that were they a straight plug and play?

The set I got has the original ballasts

No, the plugs are different too. You didn't think it was going to be easy did you?

 

The plugs on the back of both halogen and xenon lamps just unclip, so I made a hybrid of the two internal looms and clipped the halogen connector into the xenon lamp so that I didn't have to alter the wiring on the car if I ever sold it and took the xenons back off (which I did when I part-exed it for the CC).

No, the plugs are different too. You didn't think it was going to be easy did you?

 

The plugs on the back of both halogen and xenon lamps just unclip, so I made a hybrid of the two internal looms and clipped the halogen connector into the xenon lamp so that I didn't have to alter the wiring on the car if I ever sold it and took the xenons back off (which I did when I part-exed it for the CC).

Haha didn't think it would be easy.

Did you have any pictures of how you did it?

No pictures unfortunately, its fairly straight forward or at least it is with an aftermarket HID kit as you just connect the earth an live that would have gone to the back of the H4 bulb to the supply for the ballast. The third wire from the H4 plug provide power to the separate bulb for main beam, which will also require an earth. There are a couple of earths in the halogen plug, just consider how thick each cable is and much loading you are putting on each one so that you don't melt anything. I never had any problems with mine and I did a lot of driving in the dark commuting from Middlesbrough to Shropshire on a weekly basis.

 

If you are going to use the halogen loom as your base, just look at what each wire does on the halogen lamp and then look at the equivalent on the xenon loom, that's all I did. Some of the wires will need extending, side light for example, so use cable which is rated for high temperature as it will get fairly warm inside the lamp and you don't want the insulation melting.

Hmm it's fully oem including the ballasts. We'll have a look and see how it goes.

If not we'll see if we can find a full loom from a scrapped one

If you get the full loom you will probably need to put all of the leveling sensors on too.

 

Have fun

I think modifying the headlamps would probably be easier than swapping a whole wiring loom.

I think modifying the headlamps would probably be easier than swapping a whole wiring loom.

+1 definitely   

Let the modifying commence

The halogen connector is on top and the xenon one is below.

Can you remove the wires from the connector easily?

Why do you want to remove wires from the connector block, you should be able to mod the halogen loom to take short pieces of loom from the xenon wiring loom and just solder and sleeve them into the halogen loom.

 

The connector blocks themselves should be a straight swop into the headlamp unit.

Sorted, cut and soldered. Just need to run a wire from the switch to the fuse box so the dipped stays on

Do you know which yellow and green wire I need to do the join to? There's a choice of 2

Hmm tried both yellow and green wires and both times the driver side dipped beam was hesitant to start and the fog lights came on with the dipped beam.

Any ideas?

The yellow and green wire that I used was a fairly heavy gauge, if I remember rightly and is for the dipped beam, should have nothing to do with the fogs. Sounds like you may have got something wired wrong inside the headlamp, an earth maybe?

 

I've fitted OEM xenons on both a Bora and my old Octy and neither of them had the fog lamps coming on with the dipped beam.

 

What happens if you leave the wire to the yellow/green wire disconnected?

This wire only keeps the dipped beams on with the mains, everything else should work normally if the headlamp wiring is correct.

 

Of course the delay in the drivers side igniting could be a red herring and may be caused by a faulty igniter or ballast.

Edited 15 November, 201411 yr by ExAudiSi

The yellow and green wire that I used was a fairly heavy gauge, if I remember rightly and is for the dipped beam, should have nothing to do with the fogs. Sounds like you may have got something wired wrong inside the headlamp, an earth maybe?

I've fitted OEM xenons on both a Bora and my old Octy and neither of them had the fog lamps coming on with the dipped beam.

What happens if you leave the wire to the yellow/green wire disconnected?

This wire only keeps the dipped beams on with the mains, everything else should work normally if the headlamp wiring is correct.

Of course the delay in the drivers side igniting could be a red herring and may be caused by a faulty igniter or ballast.

I thought it could be an earth inside the unit myself tbh, will have a look into it again.

If the wires disconnected everything works as it should. Dipped beam starts straight away, without flickering, then turns off when the full beam is turned on.

When i did mine bought 2 headlight looms from broken lights 10 quid from scrappers, fitted hid kit and d2s bulbs and these every light worked as there should just extended side light bulb wires.

I thought it could be an earth inside the unit myself tbh, will have a look into it again.

If the wires disconnected everything works as it should. Dipped beam starts straight away, without flickering, then turns off when the full beam is turned on.

 

Must be something to do with the wire from the headlight switch to the fuse box then. I'll double check the wiring diagram. Did you definitely connect to pin 8 on the back of the headlight switch?

It should have been empty as standard.

Hmm it definitely showed pin 8, but wasn't empty. Had to connect it to the existing wire.

Will try the one next to it then, as that was empty. Looks a little too tight to solder in there, what did you use to connect it?

Thanks for the help so far

I bought a repair wire from the Stealers and it just plugged into the connector on the back of the switch.

The correct hole in the switch connector should be empty, I'll check the wiring diagram and make sure of the number.

I bought a repair wire from the Stealers and it just plugged into the connector on the back of the switch.

The correct hole in the switch connector should be empty, I'll check the wiring diagram and make sure of the number.

+1 here too.

You can get these from ebay too http://www.ebay.co.uk/itm/171360124643?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2648

My error

 

It is Pin 7 on the back of the headlight switch.

No problems it's been fun experimenting

Will look into the repair wire