Bi-xenon LED retrofit - coding help

[Yai]

Hi,

I have a 2012 N.American(Canada) Golf TDI Highline, that came with Halogen, in stock trim. Ended up retrofitting Bi-Xenon with LED DRLs from a 2012 GTI. I found out, the GTI was using the same midline CECM, as my TDI: 1K0937086P. My TDI software version is 0657, not sure what the GTI was.

My low beams/Xenons work, along the LED DRLs, and the high beam function. My issue is the LED DRLs are always simultaneously on, with the low beams/xenons. Ideally, it would be better to have the DRLs on(by themselves) during the day, so I’m not burning through xenon bulbs, as was a pain for to change the xenon bulbs! I’ve tried various codes on Byte 18 (currently using 22 with no errors, and all lights working). I got a euro switch, and played around with some coding, via OBD eleven long coding. I have the oem LED tails w/o rear fogs, and no bulb errors with the current coding(see below).

On my CECM coding(below), for the DRL/Xenon settings that I came across, I have the following bits checked/unchecked.

Byte 9 - Manual activation/deactivation for DRL suppressed = Active-checked
Byte 11 - DRLs /Active-checked
-Permanent Running light via low beam = unchecked
***-Bit 6=Checked (no description so not sure what this is)

Byte 14 - Bi-xenons with shutter installed =Active-checked

Byte 15 - DRLs with separate lights = Active-checked
-DRLs adaption MFA+ = Active-checked

Byte 17 - Bixenon additional high beam (installed) = checked

Byte 18 - hex=22
Byte 24 - Hex =E4
Byte 25 - DRL LED brightness =Full
-High beam via shutter Installed =checked/active

Byte 26 - DRL only with assistance driving light =unchecked

Byte 27- LED DRL module for parking light and DRL =Installed/checked


Long Code: 6F180A1B90272AC400880041400009EC48862280524D8520E48620040040


Any suggestions I could try, as I been searching everywhere, also tinkered with so many of the DRL settings, and byte 18. One thing I didn’t try, as I just read, was to give the MFD a reset to factory. I heard, some settings may not take effect, even when coded properly, if the factory reset on MFD, wasn’t done? But this person swapped out a new BCM, when they suggested to reset MFD.

Also, what should byte 18 be? I figure I should keep that setting, as a starting point, if bit 22 is incorrect?

Thanks,

Ron

 

[Wilkins]

According to the list of byte 18 coding I found somewhere once I think your byte 18 should be 3C ( line 60). I've copied part of the list in below and I think I got all of the VW360 Xenon codes. The mk 6 Golf is VW360, RdW is Rest of World, NAR is North America, I think Ska might be Scandanavia. I think Scandanavia has a different scheme for DRL, might involve tailights or??

Pretty sure PO_LED means LEDs are only used as parking lights (not DRL) According to something I just found referring to Skodas in a search for TFL_S LED_SBBR, that means LED tails as well as LED DRL, while TFL_S definately works for regular tails. Its possible your LED taillights might throw a bulb out error if coded if coded to 3D which the list says is for North America and you are presently running a SBBR code - see below. I kind of doubt you would have any problem with an RdW coding but who knows. I do know that NAR cars don't necessarily have all the wires in the wiring harness that RdW cars do.

60 3C VW360 XENON VW360 RdW XE TFL_S ROM 60 VW360 VW360 RdW XENON XE TFL_S ROM 60
61 3D VW360 XENON VW360 NAR XE TFL_S ROM 61 VW360 VW360 NAR XENON XE TFL_S ROM 61
62 3E VW360 Halogen VW360 NAR ROM 62 VW360 VW360 halogen NAR ROM 62
63 3F VW360 XENON "VW360 Ska XE TFL_S LED_SBBR" ROM 63 VW360 XENON "VW360 Ska XE TFL_S LED_SBBR" ROM 63
64 40 VW360 Halogen VW360 RdW ROM 64 VW360 VW360 halogen ROW ROM 64
65 41 VW360 XENON VW360 RdW XE PO_LED ROM 65 VW360 VW360 RdW XENON XE PO_LED ROM 65
66 42 VW360 XENON VW360 Ska XE TFL_S_LED ROM 66 VW360 VW360 Ska XENON XE TFL_S_LED ROM 66
67 43 VW360 Halogen "VW360 Ska TFL_S LED_SBBR" ROM 67 VW360 halogen "VW360 Ska TFL_S LED_SBBR" ROM 67
68 44 VW360 XENON "VW360 RdW XE LED_SBBR" ROM 68 VW360 XENON "VW360 RdW XE LED_SBBR" ROM 68
69 45 VW360 Halogen VW360 Ska TFL_0_S ROM 69 VW360 VW360 halogen Ska TFL_0_S ROM 69
"
I think 22 is for Japan, halogens with LED tails.

34 22 VW360 Halogen "VW360 RdW/Japan+LED_SBBR" ROM 34 VW360 halogen "VW360 ROW / Japan + LED_SBBR" ROM 34


PM me if you would like the whole list.



I'm coded at 4F per this list for a VW 362 (Sportwagen) with Xenon + LED but no rear fog or LED tails and everything works well. My long code is:

2D380E3F982F3EC40008008140000DCC03044F08535D8560F48020040000 if you want to puzzle through what that means. I'm pretty sure it won't work well in your Golf. I will take a look tomorrow to see what bits I have checked that might be different from what you have.



I'm sure you are aware but it is a good idea to keep a battery charger hooked up when changing byte 18. A few people have bricked the BCM doing this and it is rumoured to be related to low voltage from a tired battery.


If none of the above work try searching through the long thread on the Ross-Tech forum about this. I can't remember what it is called anymore but the right byte 18 coding for LED tails and Xenons is in it somewhere.


Have fun and let us know how it goes.

 

[Yai]

Thanks Wilkins! I'm going to give 3C, and if needed, 3D a try. I did some searching on Rosstech forums, and saw those codes you gave me. I also saw the full list, and checked yours.

Is ROW the same as RdW?

I'm a little lucky, as I wasn't really aware of the problems I could have encountered, changing byte 18! I must have changed byte 18 20-30 times, in trial and error, to see what it does!

Throughout this troubleshooting, I did learn a lot with long coding the BCM lol! this will probably be my last attempt, in changing byte 18, before I get some help with my guy with VCDS, and the one that retrofitted the lights for me. At least all my lights work, so I can live with having DRLs and low beams functioning simultaenously

Thanks!

 

[Yai]

@Wilkins I got some bad news, and then some good news...

Bad news first, 3C didn't work for me and gave me bulb out error. Now, for the good news. 41 worked and all is good now!! I figured it'd try a few of those codes, from the list you gave (for the Xenon equipped LEDs) and hallelujah! everything works properly, and my DRLs work on their own, and no bulb out errors!

Thank you so much, on more than a few occasions. I've searched and followed your build, to help troubleshoot my xenon retrofit. I learned a heck of a lot, and I can also shut off my DRLs, through the MFD, not that I would.

Thanks again, as this has been a thorn on my side, for several months! I owe you a beer, next time I'm in BC. I do go to the west coast, every few years, just to snowboard

Cheers,

Ron