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Thread: Car Won't Start when OBDII connected?

  1. #1
    Variable Bitrate
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    Car Won't Start when OBDII connected?

    Does anyone have this problem? Mind you the computer has not yet been installed in the car, but I was in the process of running wires and so I connected the OBDII diagnostic tool and then the car would not start? This is on a 2005 Impala. Any ideas? If it had been connected to the carputer, do you think it would have started?
    2005 Black Chevy Impala
    Current Status: Installed in Vehicle/Testing 75%

  2. #2
    What can I say? I like serial. Curiosity's Avatar
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    Oh that's not good. It should still start even without the PC connected or on. What diagnostic tool are you using?

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    Variable Bitrate Fox_Mulder's Avatar
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    What happens if the car is already started and you plug the diagnostic tool in?
    Fox Mulder
    2004 Toyota MR2
    Intel Dual Core 2.0Ghz 1Gb DDR2 160GB SATA2 M4ATX Xenarc 700TSV TS BU353 DiNovo Mini Car2PC ODBII Bluetooth HF 16x2 Character LCD

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    If your using the br-3 the software says that you turn the car on then plug the device in. Some cars wont start while the BR-3 is connected.

  5. #5
    Variable Bitrate
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    Quote Originally Posted by Sonicxtacy02
    If your using the br-3 the software says that you turn the car on then plug the device in. Some cars wont start while the BR-3 is connected.
    That is the one I am using...if I plug it in while the car is running, it will work fine until the next time I start the car (won't start). Anyone know of a solution to this?

    Edit: (other than the obvious)
    2005 Black Chevy Impala
    Current Status: Installed in Vehicle/Testing 75%

  6. #6
    Confusion Master
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    Quote Originally Posted by Shelbrain
    That is the one I am using...if I plug it in while the car is running, it will work fine until the next time I start the car (won't start). Anyone know of a solution to this?

    Edit: (other than the obvious)
    Hack the cable , put a switch in.

    or put a relay in so the the cable is only connected when the IG is on. (might have to put a delay on this as well)

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    yea i added a switch. Just strip the wire cover down.. clip the red wire and add a switch in the middle

  8. #8
    What can I say? I like serial. Curiosity's Avatar
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    If it's on serial you should be able to control it with the DTR line. With a transistor and relay or something. You would just need to make sure the software isn't running when you start the car, which most of the time won't be the case.

  9. #9
    Constant Bitrate
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    Quote Originally Posted by Shelbrain
    Does anyone have this problem? Mind you the computer has not yet been installed in the car, but I was in the process of running wires and so I connected the OBDII diagnostic tool and then the car would not start? This is on a 2005 Impala. Any ideas? If it had been connected to the carputer, do you think it would have started?

    I have the 2003 Impala, and there is no problem with starting the car with the ODBII connector. Actually, I just tried starting it with the connector not attached to the computer. Started fine....

    Dwaine
    2003 Black Impala

  10. #10
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    Quote Originally Posted by Curiosity
    If it's on serial you should be able to control it with the DTR line. With a transistor and relay or something. You would just need to make sure the software isn't running when you start the car, which most of the time won't be the case.

    Care to put that so it would make sense to a NEWB in electronics

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