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OVMS failure

Discussion in 'Roadster' started by simonog, Mar 1, 2017.

  1. simonog

    simonog Member

    Joined:
    Jan 9, 2014
    Messages:
    392
    Location:
    United Kingdom
    My OVMS box has stopped working :(

    When powered on, it shows two flashes from red and green, a pause from red while green flashes once and then red and green on together for a few seconds; then 10 flashes from green; the 10 flashes repeat a few times' and then the whole cycle repeats.

    I have checked the SIM card and it's working fine.

    Do I read the manual correctly to deduce that the modem has failed? In which case am I marooned high and dry until OVMS makes it out of development? Or does anyone know how one can resurrect/replace the modem?

    Please forgive the duplicate post - i think this got lost in the middle of another chain.
     
  2. ravng

    ravng Member

    Joined:
    Sep 9, 2014
    Messages:
    88
    Location:
    Norway
    I had this issue on my ovms when I first got it, don't know if it's related.

    Connected to the car it produced the same led sequence as you, but on my bench with a serial debug cable attached it started up no problems.

    After some investigation I found that when powered thru the OBD port a lot of non-readable characters was produced on the modem RX line, confusing the modem. The quick fix was a pulldown resistor on the rx/tx lines and it has worked without a flaw afterwards.
     
    • Informative x 1
  3. simonog

    simonog Member

    Joined:
    Jan 9, 2014
    Messages:
    392
    Location:
    United Kingdom
    @ravng: I might try that - where did you fit the resistor and what value?
     

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