Mk 7 Golf R. 7.5 LED headlamp upgrade

[Protec]

Hi all

I've got a 2015 Mk7 Golf R. It has factory Xenon headlamps. I've fitted 2018 7.5 LED lamps to it (I believe PR 8IT)
Looking at the wiring diagram, all functions of operation are done inside the lamp rather than individual wires like the old lamps. There were 14 wires on the old lamps and only 6 on the new ones.
Unlike the old wiring diagram, it doesn't show the wiring tracks inside the lamp. However the CAN wire are the same and both lamps communicate fine.
The Kufatec MK7.5 conversion kit only shows the 2 lamps and coding dongle required. (No wiring mods)

Leaving me to the coding part. I've carried out adaption mods before for things but this is a minefield. Mainly because there is so much conflicting information available,
Posts that are not the same model as mine and most of the channels are in German.

I'm very experienced with VCDS but cant seem to fine the correct adaption channels to change for this mod.

I had found some helpful information on a forum but it didn't work. Someone who claimed that these channels were correct but after hours of trying it was no good.
It seems the channels vary quite a lot between models as I copied an ad map from my friends 2018 GTI with factory LEDs and the channels advised didn't match his car either.

From what I can see, ad maps vary between models and people are assuming by supplying the information of what they changed for their model (EG GTI rather that R) is not the same.

Id really appreciate any help from Anyone who has done this to a Golf R or actually knows the correct adaption channels to change.

Ill gladly share all the wiring diagrams or anything else I have.

The Scan below is with the front end off the car so ignore most of the faults.

Thank you in advance.

[Protec]

Chassis Type: AU-VW37 (5Q0)
Scan: 01 03 08 09 10 13 15 16 17 19 22 29 39 42 44 4B 52 5F A9 D6
D7

VIN: WVWZZZAUZ Mileage: 123048km-76458miles

01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: Malfunction 0010
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
10-Park/Steer Assist -- Status: Malfunction 0010
13-Auto Dist. Reg -- Status: Cannot be reached 0100
15-Airbags -- Status: Malfunction 0010
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: Malfunction 0010
22-AWD -- Status: Malfunction 0010
29-Left Light -- Status: Cannot be reached 0100
39-Right Light -- Status: Cannot be reached 0100
42-Door Elect, Driver -- Status: Malfunction 0010
44-Steering Assist -- Status: OK 0000
4B-Multifunc. Module -- Status: Malfunction 0010
52-Door Elect, Pass. -- Status: OK 0000
5F-Information Electr. -- Status: Malfunction 0010
A9-Struct. Borne Sound -- Status: Malfunction 0010
D6-Light Ctrl Left 2 -- Status: Cannot be reached 0100
D7-Light Ctrl Right 2 -- Status: Cannot be reached 0100
-------------------------------------------------------------------------------

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519) Labels:. 5Q0-937-08X-V2.clb
Part No SW: 5Q0 937 084 CP HW: 5Q0 937 084 CF
Component: BCM MQBAB M+ H36 0253
Serial number: 01001733300859 Dataset Number: V03935273ND 0001
Coding: 00000000000000000000000000000000000000000000000000 0000000000
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_BCMMQB 018001
ROD: EV_BCMBOSCH_018.rod
VCID: 884270E862B5743A479-80DC

Wiper motor control module:
Subsystem 1 - Part No SW: 5G2 955 119 A HW: 5G2 955 119 A Labels: 5QX-955-119-V1.CLB
Component: WWS 150228 042 0551
Serial number: 150304025110
Coding: 0E4DDD

Anti-theft alarm system sensor:
Subsystem 2 - Part No SW: 5Q0 951 172 HW: 5Q0 951 172
Component: Sensor, DWA 005 0315
Serial number: 000000000ZY1504835TZ

Alarm horn:
Subsystem 3 - Part No SW: 5Q0 951 605 HW: 5Q0 951 605
Component: Sirene, DWA 004 0311
Serial number: 00000000000061839633

Humidity sensor: interior:

4 Faults Found:
133899 - Voltage Supply; Terminal 30 for Seat Heaters
B1411 13 [00001001] - Open Circuit
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 1
Fault Frequency: 1
Reset counter: 207
Mileage: 123048 km
Date: 2025.08.21
Time: 15:52:08

Terminal 15 status: On
Terminal 50 status: OFF
CAN-Bus_aktiv: On
Status Bremslichtschalter (HW): OFF
Status Bremslichtschalter (CAN): OFF
OFF: operated
Position lamps: Not operated
Automatic high beam assist: Not operated
Low beam: Not operated
Parking light left: Not operated
Parking light right: Not operated
last_wakeup: no cause for fault protection
Voltage: 14.2 V
Outside temperature: 19.0 C

568342 - Databus
U1123 00 [00001001] - Received Error Message
[LCM rechts - Blinker defekt]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 1
Reset counter: 207
Mileage: 123048 km
Date: 2025.08.22
Time: 14:34:02

Terminal 15 status: On
Terminal 50 status: OFF
CAN-Bus_aktiv: On
Status Bremslichtschalter (HW): OFF
Status Bremslichtschalter (CAN): OFF
OFF: operated
Position lamps: Not operated
Automatic high beam assist: Not operated
Low beam: Not operated
Parking light left: Not operated
Parking light right: Not operated
last_wakeup: no cause for fault protection
Voltage: 12.7 V
Outside temperature: 19.5 C

569092 - Databus
U1121 00 [00001001] - Missing Message
[LCM links - LCM_Feh_LM_L_alt aktiv]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 1
Reset counter: 207
Mileage: 123048 km
Date: 2025.08.22
Time: 14:06:52

Terminal 15 status: On
Terminal 50 status: OFF
CAN-Bus_aktiv: On
Status Bremslichtschalter (HW): OFF
Status Bremslichtschalter (CAN): OFF
OFF: operated
Position lamps: Not operated
Automatic high beam assist: Not operated
Low beam: Not operated
Parking light left: Not operated
Parking light right: Not operated
last_wakeup: no cause for fault protection
Voltage: 12.5 V
Outside temperature: 19.5 C

576516 - Databus
U1121 00 [00001001] - Missing Message
[LCM rechts - LCM_Feh_LM_R_alt aktiv]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 10
Reset counter: 207
Mileage: 123048 km
Date: 2025.08.21
Time: 16:19:49

Terminal 15 status: On
Terminal 50 status: OFF
CAN-Bus_aktiv: On
Status Bremslichtschalter (HW): OFF
Status Bremslichtschalter (CAN): OFF
OFF: operated
Position lamps: Not operated
Automatic high beam assist: Not operated
Low beam: Not operated
Parking light left: Not operated
Parking light right: Not operated
last_wakeup: Pin A54 Klemme S
Voltage: 13.1 V
Outside temperature: 20.0 C

[Protec]

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[Protec]

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[Protec]

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[DV52]

Protec: Hi. Thanks for transferring this matter from a PM to a proper forum thread - much more appropriate!!!

Clearly from the SCAN errors - the Gateway module on this car can NOT communicate with either of the pair of modules in each of the left/right headlight units. It's not clear (to me at least) if this is a physical wiring problem, or a coding issue (I suspect the former).

More information needed to understand this car:

• What wiring changes were made as part of this project?
• Are the new headlight fittings TRUE-OEM, or third-party OEM?
• How is the "Kufatec MK7.5 conversion kit' involved in this project?
• What actual equipment was changed - is the 4B module original to this car?
• What is the PR number for the "factory Xenon headlamps" - maybe look on the luggage sticker (see example of the sticker below -ignore the circled entry)?

Don

[Protec]

Thanks for the reply.
To clarify, the module communication is fine.
The scan was the first time with lights plugged in. I've plugged them in and had a look at the adaption values just so I can see what I'm up against.

There are only 2 wiring diagrams for this car. The new lights are for the PR code 8IT. The old lamps were 8IM (See screenshots attached)
The replacement led lights are genuine used lights.
Kufatec was used for a comparison, if you look at what the kit includes, it only says lamps and coding dongle, and a massive price tag.
All modules are factory fitted as far as I know.


Like I said, on the old lamps each bulb have their own individual wire, the new lamps it seems everything is controlled inside the lamp.
There are 2 can wires in the same location as the old lamps,
Earth wires are the same
The ignition fused live on the new lamps is pin 4 on the old lamps needs to be moved to pin 8 on the new lamps. (Wiring diagrams attached)
tached.
All other pins on the new lamps do not have terminals in them so will be redundant.

I hope I've given enough information.

Sorry if there is a delay in replying. UK time difference.

[DV52]

Protec: Thanks for the additional information.

As a preface to this reply, allow me to introduce the concept of a Leuchte-set. As you may be aware, the 35 x exterior lights on a MQB platform car (like this Golf mk7) are controlled by what I call "Leuchte-sets" - which live in the BCM. Each lamp has its-own individual Leuchte-set.

A Leuchte-set is made-up of a group of 19 x adaptation channels whose names all start with the term "Leuchte" ("Light" in English). There are 35 x Leuchte-sets in the BCM - so there are 35 x 19 = 665 Leuchte channels in the BCM.

OK, end of lesson - back to the problem!!!

Hmm...... I've only made a cursory review of your material - but on a quick perusal of the wring diagrams, I include below my rough synopsis of the pin-out for the MX1 connectors on both the 8IM & 8IT fittings

.
I have no special understanding of these 2 x headlights - but assuming that I have read the wiring diagrams correctly, my conclusion from my table above is as follows:

1. 8IM fittings:
   • are totally reliant on the BCM for headlight lamp control - meaning that ALL lamps in these fittings are managed by Leuchte-sets
   • use CAN control primarily for beam aiming and perhaps the High-beam function
2. 8IT fittings:
   • only use Leuchte-sets for High-beam and Low-beam lamps.
   • Control of ALL other lamps in these fittings happens via CAN messages from J745 that directly communicate with the 2 x modules in the headlight fittings
   • on a simple plug-and-play basis - pin #8 MAY be problematic (depending on "equipment")

The corollary conclusion from my reasoning about the increased reliance on CAN based messaging on 8IT fittings is that at least on factory installed cases, 8IT headlights use an entirely different 4B: Multifunc. Module from 8IM installations. This is confirmed in the wiring diagrams - notice that for 8IT fittings, the connector descriptor for J745 = T26h and for 8IM fittings, the descriptor for J745=T20r.

So, as OEM installed:

• 8IM fittings use the 20 x pin connector version of J745
• 8IT fittings use the 26 x pin connector version of J745

Because "The scan [that you posted] was the first time with lights plugged in" - I have no understanding of the importance of the different 4B module matter in this retrofit project. I don't know the current status of the new headlight fittings - do the new headlight lamps work correctly?

In terms of BCM coding and based on my table conclusions, the Leuchte-sets in the BCM as factory coded for the High/Low beam lamps should be OK for the purpose of the 8IT fittings. However, the Leuchte-sets for the remaining old 8IM lamps should be disabled in the BCM because the 8IT fittings do not use these leuchte-sets.

It's entirely your choice how to disable these Leuchte-sets! The quick way to do this is to simply change the Lasttyp channel in each Leuchte-set to not active.The more correct way is to implement the changes below (for each Leuchte-set):

Lasttyp > not active
Lampendefektbit Position > 0
Fehlerort mittleres Byte DTC-DFCC > 0
Lichtfunktion A > not active
Lichtfunktion B > not active
Dimmwert AB > 0
Lichtansteuerung HD AB > Always
Lichtfunktion C > not active
Lichtfunktion D > not active
Dimmwert CD > 0
Dimming Direction CD > maximize
Lichtfunktion E > not active
Lichtfunktion F > not active
Dimmwert EF > 0
Dimming Direction EF > maximize
Lichtfunktion G > not active
Lichtfunktion H > not active
Dimmwert GH > 0
Dimming Direction GH > maximize

The actual Leuchte-sets that need to be disabled are:

• Leuchte2SL VLB10
• Leuchte3SL VRB21
• Leuchte4TFL LB4
• Leuchte5 TFL RB32
• Leuchte8FL LB39
• Leuchte9FL RB2

Don

EDIT: Ooops..... I forgot about the Leuchte-sets for the left/right front turn-signal lamps which the 8IT fittings also do not use. So also disable:

• Leuchte 0 BLK VL B36
• Leuchte1BLK VRB20

[Gutoneto]

I'm really curious to find out how did you manage to fit the MK7.5 headlights in a MK7? Have you changed the fenders, bonnet and bumper?

[Protec]

WOW. I've just read this @ 07.30m UK time. Its going to take me a while to process this. Your understanding of this is system is unbelievable. I cant thank you enough for your reply.

I'm going to check all of this and feed back to you accordingly. If I can crack this I will write step by step instructions and post them on here.

Thanks again

[Protec]

Ok. I've reviewed the info and Im very impressed with the content.
I wanted to get my head round it all before I started changing things. You have made a very good point with the J745 4B module for headlamp leveling. This would explain the missing message fault stored in the 4B also.

After looking at the 2 wiring diagrams the headlamp level sensor G76 is connected to J745 on the old 8IM lights. T26h

On the new 8IT lights G76 is connected directly to the J519 09 module. T20r.

On the 8IT 4B module, I can only see can bus connections so all level sensor signals must come via the J519 over the can network rather than physical hard wired like the 8IM.

This is probably going to be the next problem. I'll look at this later and feedback.

Thanks Don

[Protec]

Hi all,

JUST A WARNING TO ANYONE ATTEMPTING THIS.
IT IS NOT FOR THE FAINT HEARTED, PROCEED WITH CAUTION!
THIS IS NOT MY DAY TO DAY CAR SO THERE IS NO RUSH TO COMPLETE THE WORK. THE CAR WILL BE IN MY GARAGE WITH THE FRONT END OFF FOR A WHILE I COMPLETE OTHER BITS ANYWAY. IM COMPLETING THIS IN MY SPARE TIME AFTER WORK.
BE AWARE OF THE RISKS OF BRICKING THE BCM IF YOU GET THIS WRONG.

This adaption is made very hard by the fact that I do not speak German. The information supplied above regarding the adaption channels is abbreviated slightly.
There are hundreds of channels that also don't seem to be in any perfect order when reading with VCDS. (EG you can be looking for a channel ending with 2 which can be found below the same channel that starts with 15)
Computer logic I assume as you would expect it would go from 1 > 19 however it actually puts the number 2 after 19.

Sorry for the moan but this makes the job very critical to make sure you get the correct channel and you end up scrolling up and down the list of channels aimlessly looking for them.

Hence my next question. I'm trying to do it as advised the "correct way". I didn't really understand your instructions till I had VCDS in front of me and saw it for myself.
My car has 646 Leuchte channels.

Your instructions
It's entirely your choice how to disable these Leuchte-sets! The quick way to do this is to simply change the Lasttyp channel in each Leuchte-set to not active.

On my vehicle I counted about 35 Leuchte sets. Are you saying that the Lasttyp in all 35 channels needs changing to not active or just the Lasttyp in the sets below?

• Leuchte2SL VLB10
• Leuchte3SL VRB21
• Leuchte4TFL LB4
• Leuchte5 TFL RB32
• Leuchte8FL LB39
• Leuchte9FL RB2

It took me a while to do the quick way. I disabled the lasttyp in the above sets and now nothing works.

I've then set about doing it the correct way.

Again to clarify, are these changes required for just the above sets?

I ran out of time after completing all changes for Leuchte2SL VLB10.

I've attached a control module channel map for reference of where I'm at so far.

Thanks all

Sorry couldn't attach a csv file so pasted it below (Changes so far in red)

[Protec]

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[Protec]

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[Protec]

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