Enable/Retrofit Adaptive Cruise Control Mk7 Golf Wolfsburg

   #1  

dgoodell

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I have a lot of traffic on my way to work so regular cruise control is basically useless for my commute. I bought a new 2017 Golf Wolfsburg a little a while ago and thought that it might be possible to enable ACC since the car already had the radar for the front braking assistance. I noticed that the car didn't have the ACC button on the steering wheel so I figured the 1st order of business was to get new steering wheel buttons and install them.

The original P/N was 5G0 959 442 P. I noticed that the 2017 Golf SEL Alltrack used 5G0 959 442 R. Unfortunately, I couldn't find that P/N used (new is way too expensive) so I found 5G0 959 442 K online. I installed the button relatively easily and started the car up. Unfortunately, none of the buttons seemed to work properly and it was not clear what I had to change.

I modified the coding of a few modules and ACC shows up as on option under the instrument cluster however the cruise control buttons still do nothing.

If I remember correctly I modified the coding in the Engine ECU to change from regular cruise control to adaptive with front assist and the adaptation channel on the CAN Gateway to change the multifunction steering wheel from GRA-High to ACC-High. There may have been a few other small things I changed but I can't recall them right now.

There are a few faults showing up currently:
01: Engine: No communications with cruise control front distance sensor
13: Auto Dist. Reg: Implausible message
17: Instruments: Missing message

Does anyone have any experience with this? Is the problem that I am using the wrong part number steering wheel buttons. Is what I'm trying to do even possible?
Would it be possible to get the regular cruise control with these buttons or do I have to change it back to the original buttons?
Thanks for any assistance anyone may be able to provide.

The original autoscan log of my car and adaptation channel maps for a few modules are here:
ftp://batdan.uk.to
Here is my current autoscan file:
Code:
Sunday,20,August,2017,13:39:31:62507
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 8 x64
VCDS Version: 17.8.0.1 (x64)  HEX-V2 CB: 0.4401.4
Data version: 20170721 DS276.2
www.Ross-Tech.com

VIN:   License Plate: 
Mileage: 2829km-1757mi   Repair Order: 

Chassis Type: AU-VW37 (3Q0)
Scan: 01 02 03 05 08 09 13 15 16 17 19 2B 3C 42 44 52 5F 75

VIN: 3VW217AU6HM050391   Mileage: 2829km-1757miles

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
13-Auto Dist. Reg -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: OK 0000
2B-Steer. Col. Lock -- Status: OK 0000
3C-Lane Change -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
75-Telematics -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CXBB)       Labels:. 06K-907-425-V1.clb
   Part No SW: 8V0 906 264 K    HW: 06K 907 425 B
   Component: 1.8l R4 TFSI  H13 0003  
   Revision: --H13---    
   Coding: 091A00122444042F1000
   Shop #: WSC 00066 790 00221
   ASAM Dataset: EV_ECM18TFS0208V0906264K 001004
   ROD: EV_ECM18TFS0208V0906264K.rod
   VCID: 44D244805E149D973F2-8010

1 Fault Found:
22008 - No Communications with Cruise Control (Front) Distance Sensor 
          U0235 00 [039] - -
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Mileage: 2829 km
                    Date: 2017.08.20
                    Time: 13:34:57

                    Engine speed: 0.00 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 66 °C
                    Intake air temperature: 39 °C
                    Ambient air pressure: 980 mbar
                    Voltage terminal 30: 12.128 V
                    Dynamic environmental data: 00
                    Unlearning counter according OBD: 40
                    Engine: operating status: ES
                    ECU_STATE: ENG_STOP
                    Engine oil temperature: 30.0 °C
                    Time since engine start: 0.0 s
                    T_ES: 4 min
                    Cruise control switch actuation-Main switch: not activated
                    Cruise control switch actuation-Setting: not activated
                    Cruise control switch actuation-Activation: not activated
                    Cruise control switch actuation-Status: OK
                    Cruise control switch actuation-Accelerate: not activated
                    Cruise control switch actuation-Decelerate: not activated
                    Cruise control switch actuation-Cancel: not activated
                    Cruise control switch actuation-Main switch hardware: not activated
                    Cruise control switch actuation-Coding: plausible
                    Cruise control switch actuation-Limit function: not selected
                    Cruise control switch actuation-Limit button: not activated
                    Cruise control switch actuation-Main switch CAN: not activated
                    Cruise control switch actuation-Large increment: not activated
                    Cruise control switch actuation-Control component verified: Yes
                    T_AST_SAE: 0 s

Readiness: 1110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels: None
   Part No SW: 09G 927 158 AR    HW: 09G 927 158 
   Component: AISIN AG6 G3  202 3198  
   Coding: 010200000C000000000000000000000000000000
   Shop #: WSC 00066 790 00221
   ASAM Dataset: EV_TCMAQ250031 002009
   ROD: EV_TCMAQ250031_002_VW25.rod
   VCID: 0350879C1B9A5AAF468-8056

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:| 5Q0-907-379-ESP-V1.clb
   Part No SW: 5Q0 614 517 AQ    HW: 5Q0 614 517 AF
   Component: ESC           H62 0400  
   Revision: 00000000    Serial number: 50027000000143
   Coding: 01FA6AA12425096C407A020980C42980562490024001943410405050C082430000000012121212B835351919323200
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_Brake1UDSContiMK100ESP 036010
   ROD: EV_Brake1UDSContiMK100ESP_036_VW37.rod
   VCID: 005A88900A8C41B75BA-8054

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J518)       Labels:| 5Q0-959-435.clb
   Part No SW: 5Q0 959 435 B    HW: 5Q0 959 435 
   Component: VWKESSYMQB    021 0710  
   Revision: 00021000    Serial number: 0426439587
   Coding: 032C0C
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_KessyHellaMQBAB 002019
   ROD: EV_KessyHellaMQBAB_002_VW37.rod
   VCID: 3B203F7C23EAE26F4E8-806E

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J301)       Labels:| 5G0-907-426.clb
   Part No SW: 5GM 907 426 E    HW: 5GM 907 426 E
   Component: AC Manuell    H03 1801  
   Revision: 00001K04    
   Coding: 00020004200100000000000000000002
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_ACManueBHBVW37X 004134
   ROD: EV_ACManueBHBVW37X_004_VW37.rod
   VCID: 4ACE6AB87C304BE7C5E-801E

   Fresh Air Blower Front: 

   Refrigerant Pressure And Temperature Sender: 

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 5Q0-937-08X-V2.clb
   Part No SW: 5Q0 937 087 AN    HW: 5Q0 937 087 AN
   Component: BCM PQ37BOSCH 032 0223  
   Revision: --------    Serial number: C86402021701R5
   Shop #: WSC 00066 790 00195
   ASAM Dataset: EV_BodyContrModul1UDSBosc 017002
   ROD: EV_BCMBOSCH_017_VW27.rod
   VCID: 0748938C2FA2768F1A0-8052

   Control Unit For Wiper Motor: 
   Subsystem 1 - Part No SW: 5G1 955 119 A    HW: 5G1 955 119   Labels: 5QX-955-119-V1.CLB
   Component: WWS    161105  043 0551 
   Serial number: 97022066161121064916
   Coding: 0E4DDD

   Rain Light Recognition Sensor: 
   Subsystem 2 - Part No SW: 5Q0 955 559 B    HW: 5Q0 955 559 B  Labels: 5Q0-955-547.CLB
   Component: RLS  042 0105 
   Serial number: S7Y16M12D23H05M07S57
   Coding: 06A8DD

   Sun Roof: 
   Subsystem 3 - Part No SW: 5GD 959 591 A    HW: 5GD 959 591 A
   Component: J245 PS60.006  H07 0170 
   Serial number: 03691623530111161752
   Coding: 181803

No fault code found.

-------------------------------------------------------------------------------
Address 13: Auto Dist. Reg (J428)       Labels:| 3Q0-907-572.clb
   Part No SW: 5Q0 907 572 H    HW: 5Q0 907 572 H
   Component: ACC BOSCH MQB H10 0620  
   Coding: 3500000101FFC428949C810500301600000000000000000000
   Shop #: WSC 00066 790 00221
   ASAM Dataset: EV_ACCBOSCHVW416 002005
   ROD: EV_ACCBOSCHVW416.rod
   VCID: 3C223C6026E4E557472-8068

1 Fault Found:
1116 - Databus 
          U1122 00 [009] - Implausible Message
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 88
                    Mileage: 2829 km
                    Date: 2017.08.20
                    Time: 13:34:55

                    Dynamic environmental data: 00
                    Control Module temperature: 55 °C
                    Voltage terminal 15: 12.0 V
                    Velocity_vehicle_reference: 0.00 m/s
                    Longitudinal_acceleration_vehicle_reference: -0.00 m/s²
                    Status_ACC_System: ACC_reversible_error


-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 5Q0-959-655.clb
   Part No SW: 5Q0 959 655 J    HW: 5Q0 959 655 J
   Component: AirbagVW20    010 0830  
   Serial number: 003GCR070NY-
   Coding: 8CCCFC00000000005000001AC24800000065
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_AirbaVW20SMEVW37X 002144
   ROD: EV_AirbaVW20SMEVW37X_VW37.rod
   VCID: 47C8538C6F22B68FDA0-8012

   Occupant Detection: 
   Subsystem 1 - Part No SW: 4M0 959 339 B    HW: 4M0 959 339 B
   Component: BF-Gewichtss.  H13 0022 
   Serial number: IBH000000000006MVJTO
   Coding: 303135

   Side Sensor Driver Front: 
   Subsystem 2 - Part No SW: -----------    HW: 480 001 712 16
   Component: SideSensor_Df  001 0887 
   Serial number: 3570000000015DF48F1Y
   Coding: 2D2D2D

   Side Sensor Passenger Front: 
   Subsystem 3 - Part No SW: -----------    HW: 480 001 712 16
   Component: SideSensor_Pf  001 0887 
   Serial number: 358000000002A83D3D1Q
   Coding: 2D2D2D

   Side Sensor Driver Rear: 
   Subsystem 4 - Part No SW: -----------    HW: 480 402 012 16
   Component: SideSensor_Dr  000 6149 
   Serial number: 3510001C3237EE369625
   Coding: 2D2D2D

   Side Sensor Passenger Rear: 
   Subsystem 5 - Part No SW: -----------    HW: 480 402 012 16
   Component: SideSensor_Pr  000 6149 
   Serial number: 3520001AF237EE33A48I
   Coding: 2D2D2D

   Front Sensor Driver: 
   Subsystem 6 - Part No SW: -----------    HW: 480 403 101 17
   Component: FrontSensor_D  001 6149 
   Serial number: 3550002AF23C4E427305
   Coding: 2D2D2D

   Front Sensor Passenger: 
   Subsystem 7 - Part No SW: -----------    HW: 480 403 101 17
   Component: FrontSensor_P  001 6149 
   Serial number: 3560002A5234FA3611F5
   Coding: 2D2D2D

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:. 5Q0-953-549.clb
   Part No SW: 5Q0 953 507 HL    HW: 5Q0 953 549 E
   Component: Lenks. Modul  003 0140  
   Revision: --------    Serial number: 12011708490023
   Coding: 0410
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_SMLSKLOMQB 020002
   ROD: EV_SMLSKLOMQB_020_VW37.rod
   VCID: 0748938C2FA2768F1A0-8052

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5G0-920-XXX-17.clb
   Part No SW: 5G1 920 840 B    HW: 5G1 920 840 B
   Component: KOMBI         244 8311  
   Coding: 0BA4191AA588CF0502886A295000000000000000
   Shop #: WSC 00066 790 00221
   ASAM Dataset: EV_DashBoardVDDMQBAB 009051
   ROD: EV_DashBoardVDDMQBAB_009_VW26.rod
   VCID: 2616FE08C8684F87016-8072

1 Fault Found:
16776996 - Databus 
          U1121 00 [009] - Missing Message
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 88
                    Mileage: 2829 km
                    Date: 2017.08.20
                    Time: 13:34:54


-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels: None
   Part No SW: 3Q0 907 530 C    HW: 3Q0 907 530 C
   Component: GW MQB High   515 5286  
   Serial number: 17021700840178
   Coding: 0101000870085900FA0000181C0F00000001050000000000000000000000
   Shop #: WSC 00066 790 00215
   ASAM Dataset: EV_GatewNF 013020
   ROD: EV_GatewNF_VW37.rod
   VCID: 2F381B2CE7920ECFF20-807A

   Alternator: 

   Multi Function Steering Wheel Control Module: 
   Subsystem 2 - Part No SW: 5G0 959 442 K    HW: 5G0 959 442 K  Labels: 3C8-959-537.CLB
   Component: E221__MFL-DC1  H17 0040 
   Serial number: 29170001392130067255
   Coding: 2C0000

No fault code found.

-------------------------------------------------------------------------------
Address 2B: Steer. Col. Lock (J764)       Labels:| 5Q0-905-861.clb
   Part No SW: 5Q0 905 861 A    HW: 5Q0 905 861 A
   Component: ELV-MQBA      H01 0120  
   Revision: 00000000    Serial number: 16000226222007
   Coding: 5D00000000000000
   Shop #: WSC 00066 790 00215
   ASAM Dataset: EV_ELVMarquMQB 004111
   ROD: EV_ELVMarquMQB_004_VW37.rod
   VCID: 343214400EB42D178F2-8060

No fault code found.

-------------------------------------------------------------------------------
Address 3C: Lane Change (J1086)       Labels:* None
   Part No SW: 5Q0 907 686 B    HW: 5Q0 907 686 B
   Component: HRE_Master    H12 0071  
   Serial number: 0414373429
   Coding: 01011103
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_HREntryHella 001028
   ROD: EV_HREntryHella_VW32.rod
   VCID: 3C223C6026E4E557472-8068

   Lane Change Assistant 2: 

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:| 5QX-959-X93-42.clb
   Part No SW: 5Q0 959 393 E    HW: 5Q0 959 393 B
   Component: TSG FS        020 0041  
   Serial number: 2301170605015S
   Coding: 003013200000020000000000
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_DCUDriveSideEWMINKLO 006003
   ROD: EV_DCUDriveSideEWMAXCONT_VW37.rod
   VCID: 41DC4D94410688BF144-8014

   Drivers Door Rear Control Module: 
   Subsystem 1 - Part No SW: 5Q4 959 811 D    HW: 5Q4 959 811 D  Labels: 5QX-959-81X-V1.CLB
   Component: Fond FHSG DRV  007 0002 
   Serial number: 00000000000005476759
   Coding: 011000

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist (J500)       Labels:| 5Q0-909-144.clb
   Part No SW: 5QM 909 144 A    HW: 5QM 909 144 A
   Component: EPS_MQB_ZFLS  171 1072  
   Coding: 0102
   Shop #: WSC 00066 790 00221
   ASAM Dataset: EV_SteerAssisMQB 013144
   ROD: EV_SteerAssisMQB_013_VW37.rod
   VCID: 4FF87BAC87526ECF920-801A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:| 5QX-959-X92-52.clb
   Part No SW: 5Q0 959 392 E    HW: 5Q0 959 392 B
   Component: TSG BFS       020 0041  
   Serial number: 1701170605037F
   Coding: 003013200000020000000000
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_DCUPasseSideEWMINKLO 006003
   ROD: EV_DCUPasseSideEWMAXCONT_VW37.rod
   VCID: 40DA48904A0C81B71BA-8014

   Passengers Rear Door Control Module: 
   Subsystem 1 - Part No SW: 5Q4 959 812 D    HW: 5Q4 959 812 D  Labels: 5QX-959-81X-V1.CLB
   Component: Fond FHSG PSG  007 0002 
   Serial number: 00000000000005235870
   Coding: 091000

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:| 5G0-035-MIB-STD2.clb
   Part No SW: 3Q0 035 844 A    HW: 3Q0 035 844 A
   Component: MU-S-S-US     710 0751  
   Serial number:               
   Coding: 02730000FF00000051220001001808009F0100D40120010002
   Shop #: WSC 00066 790 00215
   ASAM Dataset: EV_MUStd4CDELP 001001
   ROD: EV_MUStd4CDELP_VW26.rod
   VCID: 2D040124ED9E7CDFC0C-8078

   Operating And Display Unit 1: 
   Subsystem 1 - Part No SW: 3G0 919 605 H    HW: 3G0 919 605 H
   Component: ABT_Std-2  H53 1031 
   Serial number: VWZ8Z9TJW025JE      

No fault code found.

-------------------------------------------------------------------------------
Address 75: Telematics (J949)       Labels:| 5QE-035-285.clb
   Part No SW: 5QE 035 285 A    HW: 5QE 035 285 A
   Component: OCULowMQBUS   007 0570  
   Coding: 02730002C2823A017F1E06000000
   Shop #: WSC 00066 790 00215
   ASAM Dataset: EV_OCULowMQB 001006
   ROD: EV_OCULowMQB_VW37.rod
   VCID: 43D0479C5B1A9AAF068-8016

No fault code found.

End----------(Elapsed Time: 01:28, VBatt start/end: 12.1V/12.1V)-----------
 
   #2  

Uwe

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Have you checked whether the radar sensor is really the same one as used in cars that have ACC?

I wouldn't put it past VW to do something different, even if it's only different software in the sensor, to prevent a "premium" feature like ACC from being enabled.

-Uwe-
 
   #3  

jimmyq

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needs enabling via geko online
 
   #4  

DV52

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hmm............... your autoscan doesn't appear to have a module @ address A5 - Frt Sens. Drv. Assist. I had thought that ACC needed one of these.
Don
 
   #5  

kamold

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ACC uses the auto distance radar at address 13 which is present.
A5 is the front camera module which is used for lane keeping assist and sign recognition.
 
   #6  

dgoodell

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It's the same part number as the one that is in cars that have ACC. I would think that if there was anything permanently different they would give it a different part number. I am sure it's possible but I don't know how I would be able to tell that or if it is something that the dealer can do online.

Here's the scan for address 13 from a 2017 Alltrack SEL & my car. There are some coding differences, I'll have to check and see if those are related or not later.

Code:
2017 Alltrack SEL:
--------------------------------------------------------------------------------------------------------------
Address 13: Auto Dist. Reg (J428)       Labels: 3Q0-907-572.clb
   Part No SW: 5Q0 907 572 H    HW: 5Q0 907 572 H
   Component: ACC BOSCH MQB H10 0620  
   
  Coding: 350000C141FFC428949C810520301600000000000000000000
  Coding: 3500000101FFC428949C810500301600000000000000000000
   
   Shop #: WSC 00066 790 00218
   ASAM Dataset: EV_ACCBOSCHVW416 002005
   ROD: EV_ACCBOSCHVW48X.rod
   VCID: 3C59E5AAB7652BA1F5-8068

No fault code found.

My 2017 Golf Wolfsburg:
--------------------------------------------------------------------------------------------------------------
Address 13: Auto Dist. Reg (J428)       Labels:| 3Q0-907-572.clb
   Part No SW: 5Q0 907 572 H    HW: 5Q0 907 572 H
   Component: ACC BOSCH MQB H10 0620  
   Coding: 3500000101FFC428949C810500301600000000000000000000
   Shop #: WSC 00066 790 00221
   ASAM Dataset: EV_ACCBOSCHVW416 002005
   ROD: EV_ACCBOSCHVW416.rod
   VCID: 3C223C6026E4E557472-8068
 
   #7  

dgoodell

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needs enabling via geko online
I kinda suspected this. Is this something a dealer might do if asked? I would assume that they wouldn't, it doesn't seem like there is any benefit to them at all to do this.
 
   #8  

golfi_vend

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No easy way at moment.

Hardware is same, but FEC codes for SWAP functions are different. Without correct FEC codes the feature is useless.

MQB is totally a platform wherd You need to order the features You want and can't retrofit them.
At least for now.

If i look how VCDS has planned their business, and for legal reasons also, this wont be ever possible with VCDS.
 
   #9  

dgoodell

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No easy way at moment.

Hardware is same, but FEC codes for SWAP functions are different. Without correct FEC codes the feature is useless.

MQB is totally a platform wherd You need to order the features You want and can't retrofit them.
At least for now.

If i look how VCDS has planned their business, and for legal reasons also, this wont be ever possible with VCDS.
That is unfortunate. For 2017 in the U.S. the regular Volkswagen Golf doesn't come with ACC as an option or I would have gotten it. The GTI, Sportwagon, and Alltrack all have it available as an option but that doesn't do me any good. Oh well.
 
   #10  

ASR

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You will have to get an ABS module/pump that is compatible with ACC, (pr. code 8T8 if you have an automatic or DSG, and 8T5 if its a manual, ABS module 3Q0907379AB, new 46 pin connector, plus new wire pins, new ACC compatible rear ABS sensors, steering wheel button for ACC). and that's probably why you're not getting communications between controllers. I'm referencing from 15'-16 models, for 17's it's a different story (I think).
 
   #11  

downtime

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I'm pretty sure you have messed the pr codes there.
My understanding is that 8T3 is for manual + acc, 8T5 is automatic as it incorporates stop&go and 8T8 is for newer generation acc and is for both manual and automatic.

I've done quite a bit of research on the matter and this is my understanding of ABS pr codes.

Earlier MQB cars did not have 46pin ABS. And they still support 8T3 and 8T5.
 
   #12  

ASR

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I'm pretty sure you have messed the pr codes there.
My understanding is that 8T3 is for manual + acc, 8T5 is automatic as it incorporates stop&go and 8T8 is for newer generation acc and is for both manual and automatic.

I've done quite a bit of research on the matter and this is my understanding of ABS pr codes.

Earlier MQB cars did not have 46pin ABS. And they still support 8T3 and 8T5.
I have done extensive research on this with the documentation provided by XaGiCo and ErWin, 8T5 is for manual trans, 8T3/8T8 is for auto/DSG. On my 15' GTI my cluster/speedo is only compatible with 8T5 (manual) or 8T8 (Auto/DSG) only, so in my case my 38 pin ABS unit is only compatible with 8T0, 8T2, 8T6, 8T7, thus the need to change mine to the 46 pin ABS.
 
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That information is contradicting on my car then.

I have 38pin ABS unit which according to Etka is compatible with 8T0, 8T2 and 8T5.

But yes, I'm also in a process of doing this same thing to my 2013 Seat Leon. I've gotten almost all the parts already except new stalk with distance setting for acc. I also have to update my ABS controller to the new 46pin one.

By the way, have you found out the part number for the 46pin abs controller connector? Seems to be a bit tedious to find it. My best guess according to ETKA is : 4M0998046. I would like to get definitive confirmation for this though :D
 
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