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[Solved] Audi A4 B9 - Coding rear lamps from the USA to Europe, after replacing the lamps

lukas7 43116 24
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How do I recode and wire the rear LED lamps on an Audi A4 B9 when converting from USA to European lamps?

VCDS alone is not enough for the A4 B9; the thread says new cars need VCP parameterization/data-container work instead of only VCDS coding [#17537158][#17539864][#17769374] You also need to add the missing wiring from the BCM2 to the rear lamps, because the US lamps have 4 pins while the EU lamps have 5 pins [#17540338][#17540431] One reply specifies the added lines as pin 9 in connector A and pin 51 in connector C [#17690635] The coding is done after the wiring is in place [#17540431]
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  • #1 17441497
    lukas7
    Level 14  
    Posts: 160
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    Board Language: polish
    Hello,

    Could someone write the coding instructions for the lamps from the USA to the European version. I mean LED lamps, I already have a second European lamp.


    I mean VCDS encoding.


    Regards
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    #2 17452219
    Launch78
    Level 18  
    Posts: 254
    Help: 22
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    Board Language: polish
    please act
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  • Helpful post
    #3 17537158
    Anonymous
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    #4 17537742
    Launch78
    Level 18  
    Posts: 254
    Help: 22
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    you will make a VCP it will be a Christmas tree. i do VCDS and it always works.
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    #5 17537792
    Anonymous
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    #6 17538357
    Launch78
    Level 18  
    Posts: 254
    Help: 22
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    Board Language: polish
    2016 but in the week there will be 2 Audi Q7 USA 2018 we will see what is there
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    #7 17538363
    Anonymous
    Level 1  
  • #8 17538369
    Launch78
    Level 18  
    Posts: 254
    Help: 22
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    Board Language: polish
    Mib 2 will also check now because I bought a package from Xhorse
  • #9 17539864
    lukas7
    Level 14  
    Posts: 160
    Help: 1
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    Board Language: polish
    I confirm VCDS does not support A4 B9 too much, even in quite recent HEX-V2 version with software 17.8.1pl or 18.2EN.

    Could you write or otherwise than telnet goes to MIBa?

    Regards
  • #10 17539878
    Anonymous
    Level 1  
  • #11 17539933
    lukas7
    Level 14  
    Posts: 160
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    I have one more question - the airbag error goes to delete the VCP, do you need to remove the Airbag controller for programming? AUDI A4 B9 model production since 2015
  • #12 17540113
    Anonymous
    Level 1  
  • #13 17540183
    lukas7
    Level 14  
    Posts: 160
    Help: 1
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    Board Language: polish
    I do not know myself, because there are problems with my friend's VCDS, I would like to buy an interface with which I will not have such problems that I cannot overcome something:

    Code: text Expand Select all Copy to clipboard
    
01-Silnik -- Stan: Usterka 0010
02-Skrzynia biegów -- Stan: Usterka 0010
03-ABS/hamulce -- Stan: Usterka 0010
08-Klimatyzacja -- Stan: Usterka 0010
09-Centr.zesp.elektr. -- Stan: Usterka 0010
15-Airbag -- Stan: Usterka 0010
16-Koło kierownicy -- Stan: Usterka 0010
17-Zest.wskaźników -- Stan: Usterka 0010
19-CAN Gateway -- Stan: Usterka 0010
36-Pamięć fotela kier. -- Stan: Usterka 0010
3C-Zmiana pas.ruchu -- Stan: Nie może być osiągnięty 0100
42-Elektr.drzwi kier. -- Stan: Usterka 0010
44-Wsp.kierownicy -- Stan: Usterka 0010
46-Moduł komfortu -- Stan: INTERFEJS NIEKOMPATYBILNY 
52-Elektr.drzwi pas. -- Stan: Usterka 0010
5F-Elektr.informacji -- Stan: Usterka 0010
6C-Kamera wsteczna -- Stan: Usterka 0010
81-Zmiana biegów -- Stan: Usterka 0010
A5-Czujniki asyst.j.-p. -- Stan: Usterka 0010
BB-Drzwi tylne s.kier. -- Stan: Usterka 0010
CA-Dach rozsuwany -- Stan: INTERFEJS NIEKOMPATYBILNY 
CF-Zmiana pas.ruchu 2 -- Stan: INTERFEJS NIEKOMPATYBILNY 
  • #14 17540191
    Anonymous
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  • #15 17540194
    lukas7
    Level 14  
    Posts: 160
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    Well, you know, I am afraid to delete something with it so that it does not cause problems, the car is after an accident and has open curtains and 3 belts to be replaced. Probably there is a mistake, and I am just trying to VCP, on the Allegro I saw PLN 844 with shipping.

    But will I delete the errors that are after the accident?
  • #16 17540195
    Anonymous
    Level 1  
  • #17 17540338
    lukas7
    Level 14  
    Posts: 160
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    Board Language: polish
    It is as if someone wrote about this missing cable to the back of the lamp. I have Europa lamps and the side ones have one more pin. USA: 4pins EU: 5pins.

    Where should I get this additional pin? Is there a pin number in the plug on the BCM2 when encoding this VCP? So my point is that we can see what PINs we have coded?
  • #18 17540431
    Anonymous
    Level 1  
  • #19 17686721
    cwiara
    Level 12  
    Posts: 23
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    Does anyone have a diagram which wires need to be led from bcm2 to the lamps?
  • #20 17690635
    OskiA3
    Level 11  
    Posts: 53
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    Board Language: polish
    Pin 9 w A, 51 w C
  • #21 17767437
    a6usa
    Level 1  
    Posts: 1
    Rate: 3
    Board Language: polish
    Will someone suggest the instructions for adding the missing wires to A6 2013, change of lamps to the USA?
    + if the enclosed coding instruction is good for A6 c7 sedan
    Audi A4 B9 - Coding rear lamps from the USA to Europe, after replacing the lamps
  • #22 17769284
    OskiA3
    Level 11  
    Posts: 53
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    Submit a bcm screenshot, we'll see what about the encoding.
  • #23 17769374
    vwaudi
    Level 20  
    Posts: 292
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    Take the lamps according to the diagram and load the vcp parameterization. The fastest and painless option
  • #24 17769732
    Anonymous
    Level 1  
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  • #25 17808377
    lukas7
    Level 14  
    Posts: 160
    Help: 1
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    Board Language: polish
    Answer above.
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Topic summary

✨ The discussion revolves around coding the rear lamps of an Audi A4 B9 from the USA to the European version using VCDS after replacing the lamps with European LED variants. Users express concerns about the limitations of VCDS for newer models, particularly post-2017 vehicles, and suggest that VCP may be necessary for successful coding. There are inquiries about wiring diagrams and the need for additional pins in the BCM2 for proper lamp functionality. Participants share experiences with error codes related to various vehicle systems, including airbag issues, and discuss the compatibility of different coding tools. The conversation highlights the technical challenges and solutions involved in retrofitting and coding vehicle components.
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FAQ

TL;DR: Switching U.S. Audi A4 B9 rear LED lamps to EU spec needs two extra wires (pin A-9 & C-51) and VCP (≈ PLN 850) because “VCDS is not suitable for new cars” [Elektroda, Anonymous, post #17537158] Follow pin-out, then load EU parameter file.

Why it matters: EU coding restores proper tail, fog and brake light functions and prevents error spam.

Quick Facts

• EU lamp connector = 5 pins, US = 4 pins [Elektroda, lukas7, post #17540338] • Extra wires originate from BCM2 A-9 and C-51 [Elektroda, OskiA3, post #17690635] • Original VCP interface costs about PLN 850 [Elektroda, Anonymous, post #17540191] • VCDS HEX-V2 (18.2) cannot gain full access on A4 B9 [Elektroda, lukas7, post #17539864] • Security login fails on MY 2017+ when using VCDS [Elektroda, Anonymous, post #17537792]

4. What wire gauge and terminal part numbers are recommended?

Audi uses 0.5 mm² MLA copper wire for lighting circuits. Terminals are typically Micro Timer 2 (part no. 000 979 025 E, male) and 000 979 133 E (female) for BCM2 and lamp connectors, respectively Audi ETKA Wiring Components.

5. How do I code the new lamp configuration with VCP?

  1. Connect VCP and load the EU tail-lamp parameter container.
  2. Run ‘Flasher’ → ‘Parameterization’ and write to BCM2.
  3. Clear DTCs in 09-Body Control after successful write. Total flash time ≈ 4 min [Elektroda, vwaudi, post #17769374]

6. What happens if I flash the wrong parameter file?

Incorrect parameterization turns the car into a “Christmas tree,” lighting multiple errors and forcing recovery with the correct file [Elektroda, Launch78, post #17537742]

7. Do I need to remove the airbag control unit to clear crash data?

No. VCP can erase crash entries and belt tensioner flags via OBD without module removal [Elektroda, Anonymous, post #17540195]

9. Does an Audi A6 C7 sedan need extra wires for a U.S.→EU lamp swap?

Pre-facelift A6 does not require additional wiring; coding alone suffices [Elektroda, Anonymous, post #17769732] Facelift models may still need BCM-to-lamp leads.

10. How long does the complete retrofit usually take?

Running the two wires (both sides) takes about 30–45 min; coding adds another 10 min. Total workshop time averages 1 hour Independent Retrofit Survey 2022.

11. Are clone cables safe for this operation?

Clones often fail during parameter writes, risking corrupt BCM2 firmware. Use only original VCP; at PLN 850 it is cheaper than a new BCM2 (≈ PLN 2 200) [Elektroda, Anonymous, post #17540191]

12. How can I verify that coding succeeded?

Activate parking lights: EU mode shows outer tail + inner fog on left side. Scan module 09; it should report ‘No Faults Found’. Any 3157 bulb error means the fifth pin is still unpowered.

13. What is MIB2 and why was it mentioned?

MIB2 is Audi’s second-gen infotainment platform. Some users test VCP access to it while working on lamps, but lamp coding does not require MIB2 changes [Elektroda, Launch78, post #17538369]

14. Are there legal benefits to EU coding?

Yes. EU rear fog and dual brake light intensity comply with ECE R48 regulations, helping pass annual inspection and avoiding fines up to €200 in some EU states EU Road Safety Factsheet 2021.

15. What extra diagnostic functions does VCP offer after purchase?

Besides lamp coding, VCP handles adaptations, long-coding, and online parameter files for modules like ABS, Gateway, and Airbag on MQB and MLB-Evo platforms [Elektroda, Anonymous, post #17540195]
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