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Retrofit genuine Audi Swivel/Retracting towbar A4 B9 and All-Road

Daniel Orsborne Apr 29, 2019

  1. Daniel Orsborne

    Daniel Orsborne Registered User

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    So after nearly 12 months of pain I've finally got this working. For anyone following in my footsteps wanting to install a genuine retractable towbar here's how to do it. If you only want to perform coding for a removable towbar (using genuine Audi parts to connect to the CAN bus) then you can follow the subset of instructions below.

    Prerequisits
    - Audi A4 B9 (Allroad) - these come with tow prep - but for the life of me I've never been able to get Audi to explain what this means.
    - Audi A4 B9 - need to ensure that you have space in the well below the rear bumper for the towbar to fit and extend. The cut out is approx 30cm wide by 20cm deep - I believe that on A4 models it may require cutting the space in the bottom of the rear bumper. The position of the opening means that neither the opening nor the towbar can be see when it's retracted.
    - VCDS or VCP - if you are installing a removable towbar you can code it with VCDS alone. If you are installing a restractable towbar you can code it ith VCDS prodiving your tow controller has been parameterised. If not you need VCP so that you can parameterise it. This process takes 30 seconds and is a guided function within VCP so I'm happy to help people who need it.

    Parts
    - Genuine retractable towbar
    - Allroad 8W0800491N
    - B9 the last letter of the above part number changes depending on the model - you can find out from Audi what should fit your car.​
    - Wiring loom, switch and controller: https://wibutec-shop.com/Kabelsatz-fuer-schwenkbare-Anhaengerkupplung-Audi-A4-8W
    - Tow Controller (I got mine direct from Audi so only bought the wiring loom from Wibutech) 4M0907383F (again the last digit of this seems to be different in different models.)
    - Tow bar release switch 8W0951511 (I also got this direct from Audi)​



    - OR removable towbar https://wibutec-shop.com/Westfalia-Anhaengerkupplung-Anhaengezugvorrichtung-fuer-Audi-A4-B9
    - Wiring loom and controller
    - 7 or 13 pin connector https://www.pfjones.co.uk/audi-a4-b...ds-13-pin-westfalia-dedicated-wiring-kit.html



    Installation
    The instructions from Wibutech are provided via PDF - they are 10Mb so I can't attach them here but can send them onto people that need them.


    Coding
    The Wibutech document contains the necessary coding instructions but here they are:


    Parameterising the Control Unit
    This is where I got stuck - I'd done all the above but the release button for my tow bar just refused to work. I tried changing the coding options in VCDS but it made no difference. If you're lucky your control unit may be parameterised already but it not you will need VCP to do this. I've attached a screen shot below but from the VCP file manager you download the ZDC file for the Audi A4 Tow Controller and then use the File Upload function to upload it to Module 69. The whole process took less than 30 seconds once I knew what to do and the button started working immediately.

    I now have VCDS and VCP if anyone in the Norfolk, UK area needs help with coding.
     

    Attached Files:

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  3. Brunobruno

    Brunobruno Registered User

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    I'm interested in the instal pdf !

    I'll send you my email by PM
     
  4. thierry25

    thierry25 Registered User

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    hello daniel I am mounting a trailer hitch on a4 b9 and I have the same problem; or did you find the zdc file I know little vcds ;; great job thank you
     
  5. Daniel Orsborne

    Daniel Orsborne Registered User

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    You can’t parameterise the tow controller without vcp so if the button isn’t lighting up this is what you’ll need to do.
    The other coding you can do via VCDS - it’s fairly simple to make the changes following the instruction file - if you don’t have it PM me your email and I’ll send it over

     
    Last edited by a moderator: Feb 18, 2020
  6. thierry25

    thierry25 Registered User

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    ok yes I have the led of the switch which does not light up; the lighting yes; I have vcds and odiss that I know better q parrametrage is coding or adaptation, how to contact you in MP thank you
     
  7. thierry25

    thierry25 Registered User

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    Daniel I sent you email thank you
     
  8. rob-the-viking

    rob-the-viking Registered User

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    Daniel, very helpful pist mate. I've just installed a genuine swivel tow bar to my a6 c7 and have done the VCDS coding, any chance you can do the VCP bit at some point? Im jn West Norfolk....

    Cheers,

    Rob
     
  9. Tomasz_DG

    Tomasz_DG Registered User

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    Today I installed a towbar to my Audi A4 B9 on my own and everything works like a charm.
    I would like to thank @Daniel Orsborne for provided instructions - It was really helpful.

    I would also like to share my experience that could be useful for someone, who will be installing a towbar basing on used parts (in particular used electric harness) like me. In short words, I bought a used wiring harness (the one that connects the tow controller with the electric system of the car). In my case, the connectors that are used to connect pins from the convenience system were cut off. I had to identify plugs and connectors (pin) to fix harness before mounting it:

    - 3 pin socket housings that are used to connect pins from 32-pin connectors (named "B" & "E" in the manual) are:
    3-pin MQS (Micro Quadlock System) male/female socket with MQS pins (part number: 000979012E for male and 000979009E for female)
    - 2-pin socket housing that is used to connect pin 5 of 17-pin connector "A" is:
    2-pin MCON male/female socket with 1.2mm flat pin (part numbers: 5Q0973802 for male and 4H0973702A for female)

    Basing on a wiring instruction of your car (SM_48 wiring), towbar installation manual, and information provided above, it should be very easy to connect sockets and fix harness.

    In case of questions just write them in this thread or contact me directly using PM. I will be happy to help.
     
    Cbk1006 likes this.
  10. Windrush

    Windrush Registered User

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    Hi all, I have just joined the Audi gang and too need to fit a towbar to my 2016 A4 avant. There weren't many with towbars fitted and instead got swayed with a virtual dash and B&O sound (which is lovely). Can anyone advise? is it a case of getting one off eBay ensuring all wiring and internal switch is included? And then asking Daniel kindly to help with coding?
    Regards
     
  11. Antoine006

    Antoine006 New Member

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    Hi Daniel,
    I just received the genuine audi part for my a4 allroad and I'm very interested in the installation pdf !

    I'll send you my email by PM
     
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  13. Antoine006

    Antoine006 New Member

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    Hi Daniel, since I'm a new member, I can not send you a PM.
    Could you send me a private message so that I can answer you with my email for the installation pdf ?
    Thanks in advance !
     
  14. Cbk1006

    Cbk1006 New Member

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    Hi Daniel,
    I recently purchased a used towtrust detachable towbar for a 2018 Audi B9. Its came with 7 pin designated electrics. I have no issues fitting the towbar but dont know the first thing about coding or VCDS. Im more tha happy to do it myself if you could kindly assist, Im unable to PM you.
     
  15. Windrush

    Windrush Registered User

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    Hi Tomasz, I too am wanting to fit a retractable unit but cannot find any loom or control unit around the spare wheel of my B9 avant, and the bars on ebay don't seem to include these? How did you find all the bits?
    Regards
    Andrew
     
    Cbk1006 likes this.
  16. Cbk1006

    Cbk1006 New Member

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    Hi
    Ive just fitted a detachable towbar with designated electrics, however my car wasnt prepped for towing and the electrics I got on ebay have came from a vehicle that are. What are my options.


    Pat
     

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