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IG-On Mode

Discussion in 'Gen 2 Prius Main Forum' started by Marvinh, Apr 24, 2008.

  1. Marvinh

    Marvinh Marvin

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    I was sitting in the car for about 10 minutes waiting for the wife. At first I just put the car in park and let the engine (with A/C on) cycle on & off as necessary. After a few minutes I decided to shut the car and just place it in IG-ON mode.

    Now my question: Will the engine continue to cylce on & off in the IG-ON mode to keep the main battery charged at an acceptable level?

    Thanks! Marvin
     
    #1 Marvinh, Apr 24, 2008
  2. efusco

    efusco Moderator Emeritus
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    Nope, the ICE can only cycle on in READY mode. You can drain the 12v in ACC or IG-On mode.
     
    #2 efusco, Apr 24, 2008
  3. Marvinh

    Marvinh Marvin

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    Evan, thanks for your reply. Doesn't the A/C run off the main battery and not the 12v battery in IG-ON mode?

    Thanks, Marvin
     
    #3 Marvinh, Apr 26, 2008
  4. richard schumacher

    richard schumacher shortbus driver

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    The A/C runs only from the traction (main) battery, but the point is that you can quickly drain one or both batteries in ACC or IG-ON, because the engine will not run to keep them charged. If you're going to be in the car just leave it ON, as though you were going to be driving it, and shift it into Park (NOT Neutral! The batteries don't get charged in Neutral). That way the engine will start as needed to keep everything charged up and the will car manage itself as it was designed to do. Of course you should not do this if you are parked in a completely enclosed space with no provision for removing the exhaust.
     
    #4 richard schumacher, Apr 26, 2008
  5. richard schumacher

    richard schumacher shortbus driver

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    [arrghhhh...]
     
    #5 richard schumacher, Apr 26, 2008
  6. Grunthos

    Grunthos Senior Azgoth Poetmaster

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    I don't think there's any way you could drain the traction battery in IG-ON mode as it's only connected in Ready mode. You can prove this for yourself by putting the car in Ready mode and listening for the click of the relays coming from the back of the car. Then turn the car off and put it in IG-ON mode--you won't hear the relays click.
     
    #6 Grunthos, Apr 26, 2008
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