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Thread: OBDLink connect and instrument cluster turns off

  1. #1
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    OBDLink connect and instrument cluster turns off

    When I hook up my new obdlink, the vehicle refuses to turn on. When I hook up the obdlink post-ignition (while the car is running), the car seems to freak out spewing warnings about airbags, etc. on the HUD and my instrument cluster turns off (all gauges go down to 0 and don't respond until i unplug the scantool). I am however getting obd-ii data from the scantool, so that seems to be functioning.

    Any idea what could be going on here?

    '08 Chevy Impala
    Former author of LinuxICE, nghost, nobdy.
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  2. #2
    VENDOR - ScanTool Vitaliy's Avatar
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    This sounds very strange. Do you have OBDLink or OBDLink SX? Which software are you using with it?

    Also, which Impala do you have: LS, LT, LTZ, SS? Engine displacement?
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
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  3. #3
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    Quote Originally Posted by Vitaliy View Post
    This sounds very strange. Do you have OBDLink or OBDLink SX? Which software are you using with it?

    Also, which Impala do you have: LS, LT, LTZ, SS? Engine displacement?
    It's an SS @ 5.3L. I believe it's just the obdlink, not SX.

    It does this as soon as I connect it to the obd port with no software or even connected to the pc. I am using screen and nobdy when it is connected to the PC though. I fear there may be something wrong with my car :S. I also have a SW CAN mod'd obdpro that when connected doesn't exhibit the same behavior but when I connect up with the SW CAN network, sometimes it will do this (exact conditions it happens isn't currently known atm). But, that may be an entirely different issue.
    Last edited by tripzero; 05-02-2011 at 05:52 PM.
    Former author of LinuxICE, nghost, nobdy.
    Current author of Automotive Message Broker (AMB).
    Works on Tizen IVI. Does not represent anyone or anything but himself.

  4. #4
    VENDOR - ScanTool Vitaliy's Avatar
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    What are the firmware and hardware versions of your OBDLink?

    According to the wiring diagram, the only lines connected to the DLC, are:

    16 - Vbat
    14 - CAN LO
    6 - CAN HI
    5,4 - Grounds
    1 - Low speed GMLAN

    Can you confirm that these are the only pins populated in your DLC?

    OBDLink doesn't have a connection to pin 1, so the problem you are experiencing must have something to do with HS CAN. My guess is that your network doesn't like the default state of the CAN transceiver when the protocol is closed. Try hard-setting the protocol ("ATSP 6" or "ATSP 7") to see if the problem goes away.

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
    Need to look up a diagnostic trouble code? Try the most up-to-date, free DTCsearch.com!

    You cannot send me a private message using this forum. Use my email instead: vitaliy[@]scantool.net.

  5. #5
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    Quote Originally Posted by Vitaliy View Post
    What are the firmware and hardware versions of your OBDLink?

    According to the wiring diagram, the only lines connected to the DLC, are:

    16 - Vbat
    14 - CAN LO
    6 - CAN HI
    5,4 - Grounds
    1 - Low speed GMLAN

    Can you confirm that these are the only pins populated in your DLC?

    OBDLink doesn't have a connection to pin 1, so the problem you are experiencing must have something to do with HS CAN. My guess is that your network doesn't like the default state of the CAN transceiver when the protocol is closed. Try hard-setting the protocol ("ATSP 6" or "ATSP 7") to see if the problem goes away.

    Vitaliy
    Awesome! The issue seemed to be the cable I was using as shown below next to the one that came with the obdlink:

    Name:  20110503_009.jpg
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    Not sure why the cable pins would make a difference... This cable is missing pin 1, but I should be able to hook up with the High speed CAN Bus right?

    How do I find out the firmware/hardware version? I'll try using the software that came with it through mono... who knows, maybe I'll get lucky and it'll just work.
    Former author of LinuxICE, nghost, nobdy.
    Current author of Automotive Message Broker (AMB).
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  6. #6
    VENDOR - ScanTool Vitaliy's Avatar
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    Who did you get the non-OBDLink cable from? I see several possibilities:

    - The cable has a different pinout, and one of the signals (VPW, PWM, or ISO) got misrouted to pin 1 of the DLC, wrecking havoc on SW CAN bus
    - Twisted pair not used for HS CAN, causing errors on CAN bus (but you probably would have seen the error in software)
    - Poor contact quality (same as above)

    To find out the firmware version, connect to the scan tool via a serial terminal, and enter:

    STI

    To find out the hardware revision, look on the back of the unit, or type:

    STDI

    I guess the moral of the story is, don't use OBD cables from other vendors with OBDLink.

    Best regards,

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
    Need to look up a diagnostic trouble code? Try the most up-to-date, free DTCsearch.com!

    You cannot send me a private message using this forum. Use my email instead: vitaliy[@]scantool.net.

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