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Thread: Retrofitted Golf Mk7 mfsw to a 2009 Mk6 Golf

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    Retrofitted Golf Mk7 mfsw to a 2009 Mk6 Golf

    Hi guys,

    A few days ago i've retroffited a Golf Mk7 mfsw to my 2009 Golf Mk6 and im experiencing two problems:
    - after the steering wheel was coded, all the buttons are working but the horn is not working
    - no button illumination

    As the car didnt came from the factory with any cruise control the default codding on the concenience ?calculator ( the one located in the steering wheel collumn, sorry, dont know the exact name) was 000004. Now, in order to make the buttons work, ive used the Lin 2.0 coding but regardless of the codding the horn isnt working. I've tried the followong codes 0000501,502,503,504 until 804. Also, when using the Lin 1.3 codding, nothing is working, horn or buttons.

    The only way to make the worn work is using the old codding, 000004.

    Any ideeas regarding the horn issue?
    Also, the button illumination is kind of annoying but the most important would be the horn issue.

    What did i do wrong?

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    Benevolent Dictator Uwe's Avatar
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    Got Auto-Scan?

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    sean: Hi. I'm sure that an auto-scan of your car will be the catalyst for a deluge of responses from the sage folk here - it normally is!!

    Anyhow, I'm not familiar with set-up for the horn on a mk6 steering wheel, but I am aware that the mk7 arrangement is different depending on wether the car has a MFS, or not. In particular, the earthing of the horn plate is very different

    Here's my amateur attempt at a "block diagram" showing how the two set-ups differ. My apology for the simplistic nature of the pic, but I'm trying to not infringe the Benevolent Dictator's (correct) views on copyright.



    As you can see, in the case of the MFS, the earthing for the horn plate is routed via both the Steering wheel and the MFS control module. Just as an opening suggestion, it might be prudent to compare the wiring diagrams for both the Mk6 and the mk7 and to establish how the mk6 handles horn-plate earthing.
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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    Hi,

    I really don't have experience when it comes to wiring but a friend of mine who has a little more experience than me suggested that we take out Golf 7 multifunction cable and replace it with a Golf 6 multifunction cable.
    We tried that today, unfortunately the cables are different. Both cables have 3 main pins (purple/yellow/red for the airbag,black for the steering wheel buttons and yellow that goes in the steering wheel column)
    The Golf 7 cable has a different connector that goes in the middle of the airbag and also doesn't have the cylindrical ground wire?(dont know the name of it, or whats its job)

    Golf 7 airbag pins



    Golf 7 airbag cable



    Golf 6 airbag pins



    Golf 6 airbag cable



    Tomorrow we want to make a test, install the mk6 multifunction cable in the mk7 steering wheel and also connect the 3 pins to the mk 7 airbag without connecting the cable to the middle of the airbag (also because the pins are different and it wont work) and see if the horn will work.
    The only problem is that the mk7 airbag has only 3 flat pins and no cylindrical pin vs the mk 6 who has 3 pins and a cylindrical pin.

    In the mk6 airbag, the cylindrical pin has its own place but in the mk7's airbag there is none. What is the role of this cylindrical pin????





    Are this pins the ground of the horn?
    If the controls and the horn will work, we're planning of cutting the mk7 pin (that goes in the airbag) and solder it onto the mk6 cable, hopefully will work and wont cause the airbag to deploy.
    From our knowledge the cable that fits in the middle of the airbag has only one task, to deploy the airbag in case of an accident and is not related to the horn or the steering wheel buttons.

    To sum things up a bit, here are my questions:

    - What is the role of the 3 metal pins + the cylindrical pin?
    - On the mk7 steering wheel you can mount the 3 metal pins but the cylindrical pin has no mounting bracket, would there be a problem if this wont be attached to something?

    Please let me know what are your thoughts regarding the plan.

    Much appreciate!

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    i wouldn't mess about with the wiring if you don't know how it is wired.

    if you bought the wheel and airbag, and the buttons work then the LIN is ok

    the mk7 loom should work

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    Verified VCDS User Spacewalker's Avatar
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    Quote Originally Posted by DV52 View Post
    sean: Hi. I'm sure that an auto-scan of your car will be the catalyst for a deluge of responses from the sage folk here - it normally is!!

    Anyhow, I'm not familiar with set-up for the horn on a mk6 steering wheel, but I am aware that the mk7 arrangement is different depending on wether the car has a MFS, or not. In particular, the earthing of the horn plate is very different

    Here's my amateur attempt at a "block diagram" showing how the two set-ups differ. My apology for the simplistic nature of the pic, but I'm trying to not infringe the Benevolent Dictator's (correct) views on copyright.



    As you can see, in the case of the MFS, the earthing for the horn plate is routed via both the Steering wheel and the MFS control module. Just as an opening suggestion, it might be prudent to compare the wiring diagrams for both the Mk6 and the mk7 and to establish how the mk6 handles horn-plate earthing.
    good luck with that
    1st - MK7 Buttons are not longer connect via LIN to SWCM in Mk7 only to gateway and GW will see it as SubSystem
    2nd - Mk7 Buttons connected via LIN to MK6 SWCM will not work

    If you ever see MK7 MFSW - it was not a MK7 ( 5G0) it was a new Jetta or Scirocco made in early 2015 with a 1K8 number
    They are still PQ35 platform, not like Mk7 - MQB
    HOT HOT HOT VW Touran 2005 with ACC HOT HOT HOT

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    Quote Originally Posted by Eddie-NL View Post
    i wouldn't mess about with the wiring if you don't know how it is wired.

    if you bought the wheel and airbag, and the buttons work then the LIN is ok

    the mk7 loom should work
    Hi,

    If the buttons are activated via the vcds codding then the horn is no longer usable. You push on it and there is no sound. If then the buttons are deactivated via Vcds then the horn becomes active, it works again.

    To be notted that all the parts ( steering wheel, airbag, airbag cable, buttons ) have a Mk7 code, starting with 5g0

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    Sean: I have to agree with Eddie-NL: messing round with wiring is generally a tricky thing to do at the best of times. If you are not familiar with the "black-arts" of wiring diagrams, then you are playing a guessing game with the odds stacked against a good outcome.

    In this case, you have the added concern of wanting to cut "the mk7 pin (that goes in the airbag) and solder it onto the mk6 cable". This is the cable to the airbag igniter - which is a pyrotechnic device. VW plaster their instruction manuals with lots of no-no's when handling airbag wiring. Sure, some of their warnings are a bit overly-protective, but in general their safety notices make sense.

    If you really want to proceed with this task (and I suggest that you don't) please make doubly sure that everything is at the same electrical potential (i.e. the two wires to the igniter, the two wires to the old mk6 loom AND THE SOLDERING IRON TIP. But given Spacewaker's comments, I suspect that you have more fundamental problems with this project! Perhaps solving these other matters first might be a better way of proceeding.
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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    You are right and we will not mess with the airbag igniter, its way to risky.
    Still... regarding the codding, the buttons only work when they are coded on Lin2.0 and after that the horn stops working.
    After codding them, is there any other option to reactivate the horn or finding the horn ground is the only option?

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    Quote Originally Posted by sean1987 View Post
    You are right and we will not mess with the airbag igniter, its way to risky.
    Still... regarding the codding, the buttons only work when they are coded on Lin2.0 and after that the horn stops working.
    After codding them, is there any other option to reactivate the horn or finding the horn ground is the only option?
    Sean: well... my problem is still the same, I don't have access to a mk6 wiring diagram, so I don't know how the horn plate and the MFS control module is earthed on that car. But Spacewalker's comments aren't good (he is a very knowledgeable person in this forum).

    I guess If you look at my block diagram, the earth connection from the horn plate to the MFS control module is the brown coloured wire. Since the MFS control module is physically located in the LHS of the steering wheel, you should be able to see this wire. Using a multimeter, you could check if this pin is electrically connected to the car's earth (when the steering wheel is fitted). You should also be able to trace back the other brown wire that is meant to connect to the steering column control module. Now where this wire is meant to go on a mk6 is a mystery without a mk6 wiring diagram (and there may be no suitable place for it to fit at all - which I think is what Spacewalker is saying).

    But I guess the biggest concern with your project is whether the airbag from the mk7 is suitable for the mk6 steering column control module. The fact that it has a different connector is not a good sign. Just because it is a driver's air bag doesn't mean that it can be installed in any controller! It would tragic if the airbag didn't operate as intended if needed - just too many unknowns here, alas!
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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