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Thread: Car Cranks wont start

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  1. Car Cranks wont start 
    #1
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    Hello
    Im new to this forum
    Hope we can help each other

    Car is 2006 a6 c6 3.2
    Car shut off while driving
    Tried to start but cant
    Instrument cluster wont work at all
    At first i thougt its the steering columm module
    But i think its not that
    Symptomes are:
    Remote wont work
    I can open the car just with the key
    No dash lights at all just radio
    When put the key in switch the steering unlocks
    It crank but wont start
    Gear lever isnt stuck too

    Check the battery and is all good
    Check fuses
    Tried the hazard highbeam and foot on brake method
    high beam wont work
    Hazard wont work

    I can connect to obd2 when switch is open
    But cant communicate with all modules
    Cant access steering columm module

    Faults in engine control module are:

    Databus drivetrain missing message from a/c control module

    Databus drivetrain missing message from steering columm electronics

    Databus drivetrain missing message from access start authorization control module

    Lost communication with battery energy control module a

    Ecm disabled


    What to do next?



    Thank you advanced
     
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  2. Re: Car Cranks wont start 
    #2
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    There is a J329 relay that can fail which powers the instruments cluster, this will give a fault condition as you have described.

    The 370 relay on the left hand side top where there is a missing one on the picture or as marked for 2007 onwards on the right hand side.

    The 9-point relay carrier is behind driver storage compartment.

    j329 relay 1.JPG
    Dan
    2009/2010 2.0 TDIe SE
     
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  3. Re: Car Cranks wont start 
    #3
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    Thank you very much
    I will try that later and will update
     
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  4. Re: Car Cranks wont start 
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    Ok i baught replace the relay and nothing changed
    Any other soulution?
    Cant find the problem
     
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  5. Re: Car Cranks wont start 
    #5
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    Checked again all fuses and relays tgey are all good
    Still no insturment cluster no lights no hazard
    Ehen i press the hazard the hazard led come on and stays on for 5 min
    But nothing works
    Steering wheel unlocks and gear shifter unlock too
    Only thing that work is the electrical handbrake
    And ac display

    Update:
    All problem relayed to can bus communicating if it helps
    Last edited by hezim; 06-05-2020 at 02:52 PM.
     
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  6. Re: Car Cranks wont start 
    #6
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    "
    Faults in engine control module are:

    Databus drivetrain missing message from a/c control module

    Databus drivetrain missing message from steering columm electronics

    Databus drivetrain missing message from access start authorization control module
    Lost communication with battery energy control module a "

    I would ssume that all these controllers have no power so can't talk to the ECU, & guessing "
    Databus drivetrain missing message from access start authorization control module " is preventing it from starting.

    You need a wiring diagram for your car to see where these controller get their power from & work back from there.

    Perhaps someone who has access to wiring diagrams can advise further.
     
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