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Thread: Seat Leon Cupra MY19 - ACC Retrofit

  1. #1
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    Seat Leon Cupra MY19 - ACC Retrofit

    Hi everyone,

    So I'm in the market for parts in order to retrofit ACC on a Leon Cupra MY19. I will (mostly) go for used parts for obvious reasons and here's some part codes that seem to be appropriate for the job according to my reasearch up to now:

    ACC unit (no bracket etc)

    5Q0907561H
    5Q0907561G
    3QF907561
    3QF907561A

    Compatible stalks

    5Q0953513AG
    5Q1953507BG

    Wiring harness

    https://es.aliexpress.com/item/33062...archweb201603_

    To my understanding the ACC works together with the A5 camera on MQB cars but these two can also be found on their own as well, depending on the car's equipment. I don't have an A5 camera but that's going to be the next project after the ACC and so I would like the wiring to also be included.

    What I would like to double check is if this diagram is correct for what I want to do. This was downloaded from ErWin.



    What I would also like to double check is the compatibility of my ABS unit/rear sensors and CAN Gateway. I'm 99% sure that they are compatible but if anyone can share an extra opinion I would really appreciate it. Here's the scans of the 2 modules:

    ABS

    Code:
    Address 03: ABS Brakes (J104)       Labels: 5Q0-907-379-IPB-V1.clb
       Part No SW: 5Q0 614 517 DG    HW: 5Q0 614 517 AG
       Component: ESC           H62 0654  
       Revision: 00000000    Serial number: 62818000000025
       Coding: 20EE6B925423216F877A060860C96904D62A84E160069677204250F5C206430100000012121212B835351919323200
       Shop #: WSC 00049 770 00185
       ASAM Dataset: EV_Brake1UDSContiMK100IPB 037009
       ROD: EV_Brake1UDSContiMK100IPB_037_VW37.rod
       VCID: 79AE1832B955E6E3145-802C
    
    No fault code found.
    CAN Gateway

    Code:
    Address 19: CAN Gateway (J533)       Labels:| 3Q0-907-530-V1.clb
       Part No SW: 3Q0 907 530 Q    HW: 3Q0 907 530 C
       Component: GW MQB High   439 4344  
       Revision: --------    Serial number: 0008592886
       Coding: 030100F42F085900EB0082699C0F00010001070000000000000000000000
       Shop #: WSC 00049 770 00185
       ASAM Dataset: EV_GatewNF 013044
       ROD: EV_GatewNF_SK26.rod
       VCID: 3D26CC22EDFD1AC378D-8068
    
       Alternator: 
    
       Multi Function Steering Wheel Control Module: 
       Subsystem 2 - Part No SW: 5F0 959 537 D    HW: 5F0 959 537 D
       Component: E221__MFL-PR6  H04 0130 
       Serial number: 000000000H0769091018
       Coding: 012000
    
       Battery Monitoring Control Module: 
       Subsystem 3 - Part No SW: 5Q0 915 181 J    HW: 5Q0 915 181 J
       Component: J367-BDMConti  H03 1050 
       Serial number: 75886002001810090719
    
    No fault code found.
    Now, the VCDS coding is very straightforward but it seems that I will also be needing CP protection removal and calibration. Correct?

    Any other advice/ideas before proceeding are more than welcome!

  2. #2
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    the ACC radar needs a FeC code installed and tied to your VIN which you cannot obtain in any official way. that is your bigger challenge for this retrofit.

    there are people able to help with this but they keep the secret well covered, and they don't sell it for cheap.
    my Golf left the factory with 18 ECUs. now she has 27. and counting

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  4. #3
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    Well I've already asked a guy who is asking for 400€ to do the coding remotely. That's 4 times the cost of parts.

    I have also talked to Kufatec and they did not mention anything. All they said is that it's doable.

    Is the A5 camera the same deal? FeC code etc?

  5. #4
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    Quote Originally Posted by stefan147 View Post
    Is the A5 camera the same deal? FeC code etc?
    A5 camera you can retrofit freely. But to parameterize the module for your vehicle model, you would need to use the "other tool".

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  7. #5
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    So what happens when you complete the retrofit but you ain't got the FeC code? No function at all or just limited function?

  8. #6
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    If you use the round radar what Kufatec offers in their retrofit package no FeC is needed as that radar does not have it yet.
    Only CP.

    One thing to note, the round faced radar does not work with 3Q0 A5 camera.

  9. #7
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    I did not suggest retrofitting the "old round" radar because I assume the car is just too recent. also as downtime says, the old radar wants a 5Q0 camera.

    I checked ETKA and both 5Q0 camera and 3Q0 exist on Leon, so you can retrofit the old radar and the 5Q0 camera, but again I cannot guarantee that the car network is not "too new" for those two modules.

    take a look here http://mqb.pl/en it's talking about Golf but the principle is the same.

    PLEASE replace the windshield and don't go for the butcher camera mounting method

    a few words on calibration: if you find a radar in salvage yard from Leon you can be lucky and it will not flag calibration error, although it is advised to recalibrate anyway. A5 camera there is no escape, you will have to calibrate with dealer or glass center (better IMHO).

    last advice, it is always better to buy USED modules and from same car because parameterization will be correct.
    my Golf left the factory with 18 ECUs. now she has 27. and counting

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  11. #8
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    If the OP goes for the newer radar retrofit that has predictive ACC capabilities then it will be expensive. It could be like darkchina writes that the old round faced radar does not cope too well with the other modules.

  12. #9
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    Let's not forget that if You somehow blow up the VCRN and it doesn't match FeC, You need to pay 400e again for custom FeC.
    I am a VW Freak - Le WV Freaks OR Come visit me at my work with ODIS concerns - FORSS ODIS GeKo/FaZit access for VW/AUDI/Škoda
    The world is my oyster...

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  14. #10
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    Quote Originally Posted by golfi_vend View Post
    Let's not forget that if You somehow blow up the VCRN and it doesn't match FeC, You need to pay 400e again for custom FeC.
    Have seen this happen...he got so annoyed with the prospect of having to pay again for the FEC that he reverted to regular cruise control...
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