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Problems with EV mode after Install of Sigma Switch

Discussion in 'Gen 2 Prius Accessories & Modifications' started by SECONDHANDPRIUS, Apr 21, 2012.

  1. SECONDHANDPRIUS

    SECONDHANDPRIUS New Member

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    I had an electrician follow the Sigma instructions we located open pin slot 27 and also tapped the dimmer switch and installed the switch but all we could make the car do is run as normal. The message appears in the multi-information display and a 3 beep sound. What did we do wrong? we are communicating to the ECU? The switch does not light up, however we checked the power and the tester light dims and gets brighter at the plug? Yes the battery is charged the EV mode should work. When the button is depressed it just beeps the 3 times and says it can't engage EV mode please help!
     
    #1 SECONDHANDPRIUS, Apr 21, 2012
  2. seilerts

    seilerts Battery Curmudgeon

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    EV mode only engages under certain conditions: 4+ bars SoC, engine either cold or fully warmed up, battery temperature low, etc. If you are getting 3 beeps, then you have wired it correctly.
     
    #2 seilerts, Apr 21, 2012
  3. SECONDHANDPRIUS

    SECONDHANDPRIUS New Member

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    Thanks but I understand that I can't get it to engage under any condition. it gives me the beeps and the message every time.
     
    #3 SECONDHANDPRIUS, Apr 21, 2012
  4. SECONDHANDPRIUS

    SECONDHANDPRIUS New Member

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    its alive it works........i had to disconnect the battery reconnect and run the diagnostic screen after that it now works funny?
     
    #4 SECONDHANDPRIUS, Apr 22, 2012
  5. seilerts

    seilerts Battery Curmudgeon

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    Like I said, there are conditions where it will not engage. Your battery disconnect probably cleared whatever was blocking it. IIRC, an incomplete warmup will block it, for example.
     
    #5 seilerts, Apr 22, 2012
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