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  1. #1
    Active Member Two Rings
    Join Date
    Nov 27 2017
    AZ Member #
    410394
    Location
    Odense

    Woo I got my unit now. And it works, kinda. Screen comes on, I can navigate with MMI buttons, etc., and the Audi menu comes up too.

    But the car won't start. :( I get a bunch of faults with I turn on the ignition: parking brake, ESC, tyre pressure etc., and the engine stops after a second or so.

    If I remove the CAN connector the car works fine, so I'm guessing it's a CANBUS problem. But how would I troubleshoot it?

  2. #2
    Veteran Member Four Rings
    Join Date
    Jan 03 2013
    AZ Member #
    106799
    Location
    Baltimore

    Quote Originally Posted by rt11 View Post
    Woo I got my unit now. And it works, kinda. Screen comes on, I can navigate with MMI buttons, etc., and the Audi menu comes up too.

    But the car won't start. :( I get a bunch of faults with I turn on the ignition: parking brake, ESC, tyre pressure etc., and the engine stops after a second or so.

    If I remove the CAN connector the car works fine, so I'm guessing it's a CANBUS problem. But how would I troubleshoot it?
    I would PM or email Danial directly. Something isn't right at all. When i installed mine, I did not have issues like you are describing.

  3. #3
    Veteran Member Four Rings a4android's Avatar
    Join Date
    Jun 08 2015
    AZ Member #
    336498
    Location
    Montreal, QC

    Quote Originally Posted by rt11 View Post
    Woo I got my unit now. And it works, kinda. Screen comes on, I can navigate with MMI buttons, etc., and the Audi menu comes up too.

    But the car won't start. :( I get a bunch of faults with I turn on the ignition: parking brake, ESC, tyre pressure etc., and the engine stops after a second or so.

    If I remove the CAN connector the car works fine, so I'm guessing it's a CANBUS problem. But how would I troubleshoot it?
    I just read this and I think your canbus bypass is physically disconnected. get a multimeter and check the bypass if every wire is alive and sounds good.

    It's not supposed to prevent your car starting at all. all your symptom seems there is some open circuit in various canbus lines, such as driving system canbus.

    FYI, we don't touch driving system CANBUS at all. we only tab on Convenience(climate) canbus as well as some auxiliary CAN and LINBUS.

    All your symptom sounds like driving system CANBUS is disrupted somehow. check for any bent pins.
    Daniel Kim
    2010 A4 B8 - My first car ever!
    2012 A7 C7

  4. #4
    Active Member Two Rings
    Join Date
    Nov 27 2017
    AZ Member #
    410394
    Location
    Odense

    All your symptom sounds like driving system CANBUS is disrupted somehow. check for any bent pins.
    Bingo! Well sort of:



    The pin wasn't bent but it wasn't fully inserted. The little tab that holds it in the connector wasn't protuding properly to hold it in place. I adjusted it and now the car works. Yay.

    Sorry I can't say if it is a QC issue from the factory or if I just mangled it too much. But I should have noticed it, so my fault either way.

    Anyway, problem solved. Now to put everything back together and figure out where all those other cables go. :)

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