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active bonnet malfunction

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by RICHARD THORNE, Mar 24, 2020.

  1. RICHARD THORNE

    RICHARD THORNE New Member

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    I have a A180CDI/D W176 after a slight bump the bonnet pins lifted up I have pushed these back down the bonnet closes fine,I tried to reset but the fault is b273113 open circuit and wont clear can any one help please.
     
  2. Srdl

    Srdl Senior Member

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    I think pushing the bonnet back down is just a temporary fix so you can drive the car. The pyrotechnics in the system have now fired and will need to be replaced otherwise the car is not safe and any future collision with a pedestrian could have fatal consequences.
     
  3. OP
    RICHARD THORNE

    RICHARD THORNE New Member

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    Hi Steve, so you think once its been activated it breaks a circuit which would give me the open circuit reading and I have to replace both safety pin devices.before I can wipe the code.
     
  4. Srdl

    Srdl Senior Member

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    I think so but I’m not that technical so let’s see who else comes along. They may have a more definite view.
     
  5. Srdl

    Srdl Senior Member

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    From my online manual:

    If the active bonnet has been triggered, it is raised at the rear in the area around the hinges by approximately 80 mm. The active bonnet is triggered by pyrotechnics.

    For the drive to the workshop, reset the triggered active bonnet yourself. If the active bonnet has been triggered, pedestrian protection may be limited.”
     
  6. John Laidlaw

    John Laidlaw Senior Member

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    It needs a STAR reset regardless whether it was fully triggered if I remember correctly
     
  7. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Yes, they need to be replaced and the codes erased.
     
  8. ajlsl600

    ajlsl600 Senior Member

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    an estimated cost of this is ?
     
  9. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    £150-200ish.
     
  10. ajlsl600

    ajlsl600 Senior Member

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    another bypass job then, not looking a £200 bill cos of a bad road.
     
  11. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    I think the OP crashed into something. I haven't known them to trigger on a bad road yet.
     
  12. ajlsl600

    ajlsl600 Senior Member

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    good to hear, seems another flawed system designed to have us sat at dealer. i will examine in detail, whilst i not looking to harm pedestrian or anything else that runs into road , i am not sure i should be trapped into £ 200 odd bills when i am in my lawful place. on the road. perhaps pedestrians/ cyclists should carry their own insurance for such incidents
     
  13. OP
    RICHARD THORNE

    RICHARD THORNE New Member

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    Thanks everyone I replaced both of these firing safety actuators plugged them back in to wiring loom and the fault code cleared on dash itself .
     
  14. Srdl

    Srdl Senior Member

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    Good news!
     
    alexanderfoti likes this.

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