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Thread: Coding for MkVI Golf TDI w/ "non fog" OEM Euro Golf R LED tail lights?

  1. #1
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    Coding for MkVI Golf TDI w/ "non fog" OEM Euro Golf R LED tail lights?

    I have a North American 2014 Golf TDI w/Nav. It has the original headlights/DRLs which are halogen, and original front fog lights. I did not put in a euro switch.

    I'm using a HEX-NET / VCDS-Mobile / VCDS-Cloud since I have no easy access to any Windows machines. (Macs, Linux, and iOS only.)

    I got the euro Golf R LED tail lights which ECS sells as "with fog lights but without fog function". (Mfg Part#5K0998004KT, ECS Part# ES#2221162). This set includes wire harnesses to adapt the different plugs. Installation was straight forward.

    However, finding the right byte 18 code is a huge problem. I get funky behavior no matter what it seems. The outer set of lights seem to have no issues, but the inner set never behave right. What's more, the left inner and right inner always behave differently.

    Right now I'm on byte 21, what I see is that with the headlights on, the red inner only lights up one side. In reverse with the lights on, both red inners light up, but so does a reverse light on one side only. The reverse light on the other side lights up, but only briefly after just switching on the lights, and then it fades out. So I've seen all the lights lit at some point, just never in agreement from left to right, and not at the right times. I also occasionally see the inner reds (on the rear right which is normally out while in drive) flicker one and off for a moment just after switching on the lights. But then in reverse it stays on steady.

    21 is working the best so far, but it's very asymmetrical. And also, I don't have working DRLs anymore.

    The errors I get in the dash are only about checking my right rear reverse / brake lights. No errors about the left side. I double checked the wires are fastened securely. I don't even see any flicker if I wiggle them around.

    I tried setting byte 18 to 0x1F and some other codes but always got even worse behavior.

    I mostly have avoided trying any of the codes that people know are for xenon headlights or LED DRLs.

    What's the logic behind the codes anyway... I was trying to figure out if the byte is just a bit field and some bits are related to your type of headlight and others for the tail light.

    Does anyone know what byte is right for my set up?

    I think my configuration must be a bit rarer since it's a recent model year, I opted for what I think are non fog tail lights (though the ECS description of "with fog lights but without fog function makes it unclear what exactly that even means), and because the TDI is just flat out less popular than the GTI.

    -c

  2. #2
    Benevolent Dictator Uwe's Avatar
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    What's the logic behind the codes anyway...
    There isn't any. My understanding is that Byte 18 is an index or pointer into a data structure of parameters.

    -Uwe-

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    Is there any particular info I should post here that might help?

    If no one knows a code I should try, should I try going to my VW dealership to see if they can code it properly?

    If I need to, I'm not opposed to getting a Euro switch. Or modifying the wires leading into the tail light unit (or modifying the insides of the tail light unit itself).

    There are only 3 lines that go to the tail light unit... does anyone know what they are?

    -c

  4. #4
    Benevolent Dictator Uwe's Avatar
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    An Auto-Scan so folks can see exactly what BCM you have couldn't hurt.

    -Uwe-

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  6. #5
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    Relevent bits:

    Code:
    VIN: ------AJ---------
    
    Scan: 01 02 03 08 09 15 16 17 19 25 2E 37 42 44 46 52 56 62 72
    
    01-Engine -- Status: OK 0000
    02-Auto Trans -- Status: OK 0000
    03-ABS Brakes -- Status: OK 0000
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: Malfunction 0010
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: OK 0000
    19-CAN Gateway -- Status: OK 0000
    25-Immobilizer -- Status: OK 0000
    2E-Media Player 3 -- Status: OK 0000
    37-Navigation -- Status: Malfunction 0010
    42-Door Elect, Driver -- Status: OK 0000
    44-Steering Assist -- Status: OK 0000
    46-Central Conv. -- Status: OK 0000
    52-Door Elect, Pass. -- Status: OK 0000
    56-Radio -- Status: OK 0000
    62-Door, Rear Left -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    
    
    -----------------------------------------------------------------
    Address 01: Engine	Labels: 03-01.lbl
    	Part No SW: 03L 906 019 JT	HW: 03L907309AA
    	Component: R4 2,0L EDC G000AG   5676
    	Revision: 12H16---	Serial Number:               
    	Coding: 0050078
    	Shop #: WSC 01357 011 00200
    	VCID: 864F851BA35BBDB29B2FD5-80D3
    
    No fault codes found.
    
    -----------------------------------------------------------------
    Address 09: Cent. Elect.  (J519)	Labels: 1K0-937-08x-09.clb
    	Part No SW: 1K0 937 086 T	HW: 1K0 937 086 T
    	Component: BCM PQ35  M   111 0709
    	Revision: AC111709
    	Coding: 6F180A1A90272AC4008800C17000854448010086534D8560648020200040
    	Shop #: WSC 01357 011 00200
    	VCID: 41C5D6074AF55A8A6E9DDE-8014
    
    	Subsystem 1 - 	Part No SW: 5K1-955-119	Labels: 1Kx-955-119.clb
    	Component: Wischer 2008126  0512
    	Coding: 009795
    
    2 Faults Found:
    01519 - Bulb for Back-Up Lights; Right (M17)
    	010 - Open or Short to Plus
    
    00985 - Right Tail Light (M2)
    	007 - Short to Ground - Intermittent

  7. #6
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    I saw above the byte was 00 because I set it to that after having set it to 21. I reset it to 21 and tried again. On the new auto scan it says 21 for the byte but still same behavior.

  8. #7
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    As an update I tried setting byte 18 to 21, 1F, 15, 22, 04, 55, 43, 20, 03, and 00. None of them make the right inner red lights lit when the car has the headlights on and the brakes not pressed.

  9. #8
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    Quote Originally Posted by corbyz View Post
    As an update I tried setting byte 18 to 21, 1F, 15, 22, 04, 55, 43, 20, 03, and 00. None of them make the right inner red lights lit when the car has the headlights on and the brakes not pressed.
    I finally got the tail lights working when I realized one of the wiring harnesses had an upside down connector on one end. I swapped the left and right wires and now it's all good.

    -c

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