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Thread: MQB Light Configuration Case Study

  1. #11
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    Uwe,

    apologies, that was a little scatterbrained on my part

    would you add this quote

    Quote Originally Posted by TBAx View Post
    Edit: Dimming Direction (maximize/minimize) is encoded in the brightness byte, as far as I see. Everyting below $80 is "maximize" (0-127 [$00-$7F]). Everything from this value on is "minimize" (0-127 [$80-$FF]). At least this is what I consider when looking at Somnus posted configuration for the DRLs - I suspect they turn while signal indicator is active on that specific side...?
    to the first post? or should it remain where it is.
    If my car isn't broken yet, I will find a coding string that will break it eventually

  2. #12
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    Quote Originally Posted by TBAx View Post
    Oh, wait, so that was all? We now know, how to modify front lights in newer gen BCMs?
    (Yes, I don't mind adding the information to the first post)
    That is what it seems, at least on my vehicle specifically. I believe more testing would be required for a definitive answer. It looks like a step in the right direction, however.

    Although, some of the changes I made had a tendency to set a "Control Module Incorrectly Coded" DTC, but reverting to the original value allowed the DTC to clear
    If my car isn't broken yet, I will find a coding string that will break it eventually

  3. #13
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    Quote Originally Posted by Somnus View Post
    Uwe,

    apologies, that was a little scatterbrained on my part

    would you add this quote

    to the first post? or should it remain where it is.
    Done.

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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  5. #14
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    I can confirm that any changs that I made to the Light Configuration channel including:

    Dimming Value
    Light Function
    Light Type

    are reflected in the Leuchte channels after an ignition cycle and the same is true in reverse (changes made to the Leuchte channel reflect into the Light Configuration channel)

    EDIT: See Post# 16 for an example
    Last edited by Somnus; 08-26-2019 at 02:02 PM.
    If my car isn't broken yet, I will find a coding string that will break it eventually

  6. #15
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    But does it change, what exterior lights are illuminated?

  7. #16
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    Quote Originally Posted by TBAx View Post
    But does it change, what exterior lights are illuminated?
    As an example, I modified the Lighting Configuration channel to change my GTI's Left U-light (Leuchte4TFL) to act as a turn signal

    Starting with the unmodified Lighting Configuration string

    Code:
    IDE05145-Light configuration,21 34 00 14 02 00 7F 00 00 00 00 00 00 00 00 00 21 3E 00 15 04 00 7F 00 00 00 00 00 00 00 00 00 04 48 00 4A 14 00 64 06 00 80 08 09 1A 00 00 00 04 4C 00 4C 14 00 64 07 00 80 08 0A 1A 00 00 00 01 3A 00 49 14 00 7F 06 00 9A 08 09 7F 00 00 00 01 44 00 4B 14 00 7F 07 00 1A 08 0A 7F 00 00 00 03 36 00 1A 0B 0F 7F 00 00 00 00 00 00 00 00 00 03 40 00 1B 0C 0F 7F 00 00 00 00 00 00 00 00 00 24 35 00 26 08 09 7F 00 00 00 00 00 00 00 00 00 24 3F 00 27 08 0A 7F 00 00 00 00 00 00 00 00 00 02 37 00 1E 0D 0F 7F 00 00 00 00 00 00 00 00 00 02 41 00 1F 0E 0F 7F 00 00 00 00 00 00 00 00 00 06 38 00 22 12 00 7F 00 00 00 00 00 00 00 00 00 06 42 00 23 13 00 7F 00 00 00 00 00 00 00 00 00 ,224
    broken down into the individual Leuchte channels


    Code:
    IDE05145-Light configuration,
    21 34 00 14 02 00 7F 00 00 00 00 00 00 00 00 00 
    21 3E 00 15 04 00 7F 00 00 00 00 00 00 00 00 00 
    04 48 00 4A 14 00 64 06 00 80 08 09 1A 00 00 00 
    04 4C 00 4C 14 00 64 07 00 80 08 0A 1A 00 00 00 
    01 3A 00 49 14 00 7F 06 00 9A 08 09 7F 00 00 00 
    01 44 00 4B 14 00 7F 07 00 1A 08 0A 7F 00 00 00 
    03 36 00 1A 0B 0F 7F 00 00 00 00 00 00 00 00 00 
    03 40 00 1B 0C 0F 7F 00 00 00 00 00 00 00 00 00 
    24 35 00 26 08 09 7F 00 00 00 00 00 00 00 00 00 
    24 3F 00 27 08 0A 7F 00 00 00 00 00 00 00 00 00 
    02 37 00 1E 0D 0F 7F 00 00 00 00 00 00 00 00 00 
    02 41 00 1F 0E 0F 7F 00 00 00 00 00 00 00 00 00 
    06 38 00 22 12 00 7F 00 00 00 00 00 00 00 00 00 
    06 42 00 23 13 00 7F 00 00 00 00 00 00 00 00 00
    I zeroed out the following lines for Leuchte4TFL

    Code:
    01 3A 00 49 14 00 7F 06 00 9A 08 09 7F 00 00 00
    which disabled the dimming when the turn signal was activated (06 00 9A), and the Parking light and Side Light (08 09 7F).

    Then I replaced Function A with "Blinken links Hellphase" with a dimming value of 127 and maximize as the dimming direction

    Code:
    01 3A 00 49 02 00 7F 00 00 00 00 00 00 00 00 00
    after changing that code in the BCM, the U-lights only responded when I turned on the left indicator, after which they began blinking in sync with the turn signal bulb

    And to show that the Leuchte channel updated as well, here is a snippet of an AdMap taken right after the Lighting Configuration channel was updated

    Code:
    ENG116940-ENG115958-Leuchte4TFL LB4-Dimming Direction CD 4,maximize ,16
    ENG116940-ENG115962-Leuchte4TFL LB4-Dimming Direction EF 4,maximize ,16
    ENG116940-ENG115966-Leuchte4TFL LB4-Dimming Direction GH 4,maximize ,16
    ENG116940-ENG115953-Leuchte4TFL LB4-Dimmwert AB 4,127 ,16
    ENG116940-ENG115957-Leuchte4TFL LB4-Dimmwert CD 4,0 ,16
    ENG116940-ENG115961-Leuchte4TFL LB4-Dimmwert EF 4,0 ,16
    ENG116940-ENG115965-Leuchte4TFL LB4-Dimmwert GH 4,0 ,16
    ENG116940-ENG115950-Leuchte4TFL LB4-Fehlerort mittleres Byte DTC-DFCC 4,49 ,16
    ENG116940-ENG116553-Leuchte4TFL LB4-Lampendefektbitposition 4,3A ,16
    ENG116940-ENG115948-Leuchte4TFL LB4-Lasttyp 4,1 - LED Tagfahrlichtmodul Versorgung ,16
    ENG116940-ENG115954-Leuchte4TFL LB4-Lichtansteuerung HD AB 4,Always ,16
    ENG116940-ENG115951-Leuchte4TFL LB4-Lichtfunktion A 4,Blinken links Hellphase ,16
    ENG116940-ENG115952-Leuchte4TFL LB4-Lichtfunktion B 4,not active ,16
    ENG116940-ENG115955-Leuchte4TFL LB4-Lichtfunktion C 4,not active ,16
    ENG116940-ENG115956-Leuchte4TFL LB4-Lichtfunktion D 4,not active ,16
    ENG116940-ENG115959-Leuchte4TFL LB4-Lichtfunktion E 4,not active ,16
    ENG116940-ENG115960-Leuchte4TFL LB4-Lichtfunktion F 4,not active ,16
    ENG116940-ENG115963-Leuchte4TFL LB4-Lichtfunktion G 4,not active ,16
    ENG116940-ENG115964-Leuchte4TFL LB4-Lichtfunktion H 4,not active ,16
    Last edited by Somnus; 08-26-2019 at 02:00 PM.
    If my car isn't broken yet, I will find a coding string that will break it eventually

  8. #17
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    Somnus: I don't suggest that you cease your investigations - but I had a little chuckle (which I had to share with you) at the dichotomy between what you are doing and the motto on your posts- the irony is palpable!!

    Don
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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  10. #18
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    Don,

    That's how I stumble onto most of my solutions; By breaking my car to the point it is undrivable, learning how to fix it, and sharing that information here
    If my car isn't broken yet, I will find a coding string that will break it eventually

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  12. #19
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    ^^^^^^

    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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