2005 prius will not start but 12v battery seems to be working

Discussion in 'Gen 2 Prius Technical Discussion' started by geo2000, Dec 22, 2019.

  1. geo2000

    geo2000 New Member

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    Again I appreciate all your responses. Yes I do step on the break before I press the power button and it still does not go to ready mode. It does not even go to assessory mode. Like I said before the power button light (red, orange or green) seems like it does not sense the fob key. I beginning to wonder if the fob key is damaged. But again it does unlock/lock my car doors. I did check my am2 fuse and it look fine but I changed it out anyways with no avail. I am planning to get a new 12v battery from Toyota after Christmas. I hoping that will do the trick but I am having my doubts. It just weird the power button is not responding to the fob key. Anyway Merry Christmas! Thanks for all the kindness in helping me.
     
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  2. TMR-JWAP

    TMR-JWAP Senior Member

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    Does the door ajar light come on when you open the driver door?
    I can understand how frustrating this must be. Even if the FOB circuit board is damaged, the RFID chip should be recognized when the fob is inserted into the key slot.
     
    #22 TMR-JWAP, Dec 24, 2019
    Last edited: Dec 24, 2019
  3. dolj

    dolj Senior Member

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    Don't, it is not the problem and won't fix anything – your doubts are justified. It will just cost you a couple hundred dollars of disappointment.
     
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  4. sam spade 2

    sam spade 2 Senior Member

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    And for about the 4th time in this thread, those functions are TWO SEPARATE THINGS within the same physical device.
    The money you are about to spend on a battery likely would be MUCH better spent on a visit to a Prius shop.
     
  5. bisco

    bisco cookie crumbler

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    maybe a bad fob slot or power button
     
  6. geo2000

    geo2000 New Member

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    Happy Christmas to all. No the door a jar light does not come on. The only thing that comes on on the dash board is the blinking car with the key inside and two green lights from the fob key slot but it goes away after couple seconds past by.
     
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  7. TMR-JWAP

    TMR-JWAP Senior Member

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    Check the door ajar indicator lamp by opening doors other than the driver door. See if it works for any other door. If not, my first thought is you have a loss of power on that circuit. If it works for other doors, it's probably a door position switch or wiring issue on the driver door.

    Ok, so if you were to approach the car (with no FOB on your person) and look inside you should see the "flashing car with key inside" blinking every second or two. That's the immobilizer/theft deterrent indicator light. As soon as you open any door, the door ajar light should illuminate on the dash, the two green lights on the key slot should illuminate and the courtesy light at the bottom edge of the door should light up. If you sit in the driver seat and put your foot on the brake, the brake lights should illuminate. Press the power button and you should get a beep, plus the large "key with an exclamation point" (SKS warning light) should illuminate next to the immobilizer indicator light.

    The above is what should happen when the car recognizes there is no FOB in range. Does this happen? If it doesn't, what is happening that's different?

    Have you ever had your combination meter (the main "speedometer" display) suddenly turn off while you were driving?

    And just to throw a WAG out there, the IG1 relay supplies power to the SKS ecu and Body ecu through the 7.5A ECU-IG fuse, and the combination meter through the 10A GAUGE fuse. You can pull those fuses and check to see if you have 12v at one side of those fuses. There should be 12v on one side, if not I'd say the IG1 relay is stuck open. Just a WAG, without being there.
     
    #27 TMR-JWAP, Dec 25, 2019
    Last edited: Dec 25, 2019
  8. TMR-JWAP

    TMR-JWAP Senior Member

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    Also, the KEY button on the dash under the steering wheel must be in the "out" position to have the SKS functional.
     
  9. geo2000

    geo2000 New Member

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    TMR-JWAP thank you for your help. Unfortunately, right now it's raining outside so I can't check on your suggested advices. But I appreciate your insights. I will let you know the results when I get a chance to test it.
     
  10. geo2000

    geo2000 New Member

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    I finally got a chance to go outside to check on the prius. TMR-JWAP, I did as you said to approach car without fob key. What turns on are: the flashing car with key inside blinking, the two green lights on the fob key slot, the courtesy light on the bottom front door of driver side, the door ajar light illuminates on the dash board and there is beeping sound when you open the driver door like the sound you hear when you go in reverse, brake lights turn on when I pressed the brake. What does not work is when i pressed the power button there is no beep, the SKS warning light does not turn. 12v battery is at 12.4.
     
  11. geo2000

    geo2000 New Member

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    Also SKS button is in the out position. I will the fuses you said to check. Thanks again!
     
  12. geo2000

    geo2000 New Member

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    Regarding combination meter, I replaced that about two years ago. I did not have a problem with it before this current situation happened.
     
  13. TMR-JWAP

    TMR-JWAP Senior Member

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    Geo,

    I just went out to my car without a fob and did the exact same thing. Except I did it about 50 times because I pulled one fuse at a time. I went through the sequence with each fuse removed (from the underhood and under dash boxes) and the ONLY one that gave the exact same symptoms was the AM2 fuse. Every other fuse, when removed, still allowed the SKS light to illuminate and one warning beep if the power button was pressed. When the AM2 was removed, the door ajar and the car with key symbol were still flashing..but absolutely nothing happened when the power button was pushed.

    Of course, the power button itself could always be the problem.
     
  14. geo2000

    geo2000 New Member

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    Wow! I appreciate the help again, TMR-JWAP. I will check the am2 fuse slot. Do you know if any relay are related to the am2 fuse? Also, what is the best way to check if power button is working?
     
  15. geo2000

    geo2000 New Member

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    Well I checked the am2 fuse with a multimeter and there is 12v plus going through it. For now I think the power button itself or fob key is malfunctioning or damaged.
     
  16. bisco

    bisco cookie crumbler

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    maybe
     
  17. geo2000

    geo2000 New Member

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    Thanks bisco. How do you check if it is bad power button?
     
  18. dolj

    dolj Senior Member

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    Check that the wire connector in the back is connected. Other than that, it might be a case of seeing if you can find a cheap one at a pick-and-pull place and doing a swap.
     
  19. TMR-JWAP

    TMR-JWAP Senior Member

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    A diagram of the power switch, in case that helps you.
    There's really only two options left.
    1. The switch can't function because it's not getting power to it (or it has no ground connection for a complete current path) (or as mentioned above, the harness connection is not-so-good)
    2. The switch is bad.
    And...looking at the drawing, it appears the switch actually applies ground to pin 14 and 37 of the Power Source Control ECU when it's working properly. So either the switch isn't working or the PSC ecu can't tell that ground has been applied because it has something going on.

    That pin 6/5G/5L/J25 Junction wire goes straight to the Left Cowl Side Panel body ground connection

    Power Switch.JPG
     
    #39 TMR-JWAP, Dec 29, 2019
    Last edited: Dec 29, 2019
  20. geo2000

    geo2000 New Member

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    Thanks again TMR-JWAP. Is there a way to check if power is coming to the power button?
     
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