Audi A4 facelift b8.5 halogen to factory bi-xenon

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sarah1331

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Hi all so here is my upgrade

Story: I wanted factory Bi-xenon but the wire harness I purchased didn't work correctly
The coding never went to plan so I thought up a way of modifying the headlight to plug and play no coding needed

You must use the connector from a halogen light and fit inside the Bi-xenon unit

The levelling system doesn't work I'll post a modification to sort that soon too

443f9a2b0a826d7a888d44f9d2b31dfd.jpg

Now I have factory bI-xenon no errors no coding
e1f659a4d2a1b61acf0de705cee20a5c.jpg


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Mods so far:
Halegon / Bi-Xenon
Drive select
MMi 3G plus
DAB
OEM towbar
 
Last edited:
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PLEASE HELP!, I've tried to retrofit Bi-xenons with no success, even went as far as replacing the BCM module with a highline one, got the Xenons to fully work but still can't seem to get the DRLs running, controller keeps rejecting the new code for LED DRLs
Would you mind going into a bit more detail on your wiring diagram, going to try your method instead.
Thanks in advance
 
I left everything as it is and just modified the lights if you use the pic above it will 100% work as factory if your unsure with a specific part just say I'll try


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Hi sarah1331, thanks for responding, most of you diagram makes sense but there a couple of questions i need to ask

my understand of your diagram so far
pin 9 supplies indicator signal
pin 7 ground for turn signal, DRL strip, high beam/ switchover solenoid
pin 6 HID lamp
pin 4 ground for HID
pin 8 being used to power switchover solenoid and HID to act as high beam
pin 4 used to drive the DRL led strip

my questions
1) what is the purpose of the 4700uH capacitor?
2) the diagram for pin 4 has me a little confused, am i right in assuming your not using the LED ballasts on the headlight enclosure and have wired the 12v supply to a variable voltage supply and reduced the output to 5.52v at 5A and connected this directly to both LEDs? (pin 2 and pin 3 on LED PCB)
3) what is the 24v switch you have on pin 4 or have i misread this?

thanks again
 
1. Smooth out any low currents e.g. Starting
2. Yes correct
3. It's a small bulb to avoid can bus errors you can use a 12v one but may see glow and get hot


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Thank you for clarifying that. Have the bits on order now, hopefully have it all sorted by next week. Thanks again really appreciate your help.

Oh, did you manage to sort out the leveling motor in the end?
 
Not yet no time. I believe you may not be able to change the motors so I am guessing the motors are pwm so will need to make a converter


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Any chance you can tell me your ballest part number too as there are several different types


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Which ballast, LED ballast or HID ballast?
 
Witch one does it look like
a14e6da010caf6d95f14e70d2482cfb3.png


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You may need to change coding to 23


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Yes I think you might be right, my present BCM won't accept 26 and read somewhere 23 was the alternative. When set to 23 my xenons flicker and changing byte 13 and 14 to 5D5D then corrects the flickering.
 
I only know if they flicker you need to change to 23 the keboda ones need nothing coding


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Thanks for the heads up, will put some pictures up once I get them sorted
 
Hello, is there any way to get DRL's running using the OEM LED ballasts? I am running a kufatec adapter and stock BCM but for the life of me I cannot get them to light up. For reference I changed the values on byte 1 to 23 on bye 3, 00 to 1o, set the LED brightness to 75 in adaptation.

Thank you for your help!
 
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after looking at the diagrams, pins 10 and 12 on the HID headlight regulate the LED's, while pin 4 controls the DRL on the halogen headlights. Did you run HID lamp pin 10 or 12 to harness pin 7?
 
Didn't use hid socket took sockets out of the halogen and put them into the hid housing to make it pure plug and play


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ok thanks! Also I forgot to ask, do your high beams function correctly?
 
Last edited:
Yes everything perfectly as factory


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Hi sarah !! i saw your rebuild and this very interesting.
I have b8.5 2012 and trying to set up bi-xenon.
Now i'm instaled bi-xenon with oem connectors for xenon headlights, low beams working on auto and on position "low"
DRL working only on parking light and when switch is off. Where can be problem, maybe i'm somwhere missed with coding??
Or maybe it's need additional adaption on [Adaptation - 10]

Second question, i thinking to use your scheme for connecting that headlights.
i'm interested what you used for voltage drop down to 5v??
voltage regulator or some like that stuff? and what could happen if i don't use diodes for low beam and high beam solenoid control?

Sorry for bad english ;))

Thanks for any help
 
High beams will NOT work on b8.5 lights without the proper CECM. Halogen high beams have a seperate circuit which illuminates a bulb, and the high beam in HID housings is triggered by a motor that moves the lens up and down. if you apply constant high beam voltage you WILL burn the motor out, and have no way to return the lens down to low beam position.
 
If i'm understanding right there is solenoid for control on/off high beam? (not motor) i'm understand that all work like original need another cecm, but in my case can i try to use this scheme above?
And how can i turn low beam and led drl on same time because now they working seperate each other
 
no do not try this! it will burn out the motor. Yes there is a solenoid but it only needs a few miliseconds of current to move the light up to high beam. then you need an inverted voltage to move it back down again. If you apply positive 5V then you will permanently move the light up, or you will burn out the solenoid/motor.

Have you done the proper coding? it is very simple for our cars: here is a link for CECM coding
https://my.syncplicity.com/share/gjx8ncv8mlguhls/Audi Coding

you might also need to switch pins on the CECM if you use kufatec harness.
https://imgur.com/3198d71d-0e56-482f-8671-252f55b3ff1e
 
I made my conectors acording wiring diagram.
I try to code tomorow. at this time i changed Byte 0 69 to 23 , byte 2 to 10, and 14/15 1d0d. but it strange that led drl working when light switch off or in park light position. when it on auto or low beam position working only low beam..
try tomorow and update when something happens..
Another problem i don't have opportunity to change cecm because antoher one would be with component protection
 
here is the proper wiring, according to kufatec harness. Everything works perfectly for me except high beams, which require a different CECM to work properly. I know the component protection is needed, this is why I didn't even change the CECM
http://imgur.com/30fTED0
 
Everything works perfect for me and has done for years


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I'm in confusion one guy telling work another don't work :DD
I wan't to try sarah scheme, but i need to know with witch electrical component you dropped V ouput for led, and can i dont use diodes?
 
Update. I finished car , and xenons and led working like drl/parking lights.
First problem was been when switching xenons led not lighting. Problem found in adaptation 03 turn dimming was been set to 9 (= off).
Second problem i used pin 4 from old halogen conector for parking lights,but it not worked. Then i connected pin 10(drl) grey red to hid 10 and it started to work.
Only one thing left high beam. But for this time can't get another cecm to finish fully.
 
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Look my diagram works perfect use a buck for the drop


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Do what you want I couldn't care my lights work


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Ok.
For what purpose you using diodes 10a10? Can i use another ones?

And buck should be 5A? Or i can use 1A?
 
I used 5amp buck diodes are so you don't send power back up the lines of high beam or low beam if you select the opposite one and higher rated diodes yes


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Hello. I have B8.5 2012. My previous owner retrofitted this halogen-> xenon headlight. Everything works perfectly. One thing doesnt and that is front parking lights when I exit the car without key in ignition. When Ignition is on, parking lights work fine
 
Hi guys, I can see this post have some years, and my question is if someone knows about a different way to this at the moment. Or if there is any updated cables just for plug play. I have a guy that confirmed to me that he have original xenon headlights with some kind of cables, he wants to sell them to me and he insists that they work plug play. This is a store but i'm not quite confident. I would like to know if any of you guys can give me some advise, as he says not coding needed or connections. Is this possible?

kind regards
 
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