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Thread: GMLAN SW-CAN Message woes

  1. #51
    VENDOR - ScanTool Vitaliy's Avatar
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    tripzero, what circuit are you using?
    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!

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  2. #52
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    Quote Originally Posted by Vitaliy View Post
    tripzero, what circuit are you using?
    I have a swcan modified obdpro scantool but right now I'm using the obdlink mx.
    Former author of LinuxICE, nghost, nobdy.
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  3. #53
    VENDOR - ScanTool Vitaliy's Avatar
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    I was a little confused by the "ATHV1" command.

    So am I correct in assuming all of the logs you posted earlier in this thread, were done with OBDPros, not MX?
    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.

  4. #54
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    Quote Originally Posted by Vitaliy View Post
    I was a little confused by the "ATHV1" command.

    So am I correct in assuming all of the logs you posted earlier in this thread, were done with OBDPros, not MX?
    correct, all of the posts earlier than this year (2012) are with the obdpro.
    Former author of LinuxICE, nghost, nobdy.
    Current author of Automotive Message Broker (AMB).
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  5. #55
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    Still can't seem to get the vehicle bus to wake up. I started logging the 11bit bus, let it go to sleep (about 10+mins with no activity), then hit the lock on the key fob. This is what I noticed in the log:

    Code:
    { time: '1333067013.660000085831', direction: 'in', mode: '11', data: '100 <RX ERROR' }
    { time: '1333067013.698999881744', direction: 'in', mode: '11', data: '100' }
    { time: '1333067013.736999988556', direction: 'in', mode: '11', data: '638 01 14 00 00 00 00 00 00' }
    time is in epoc seconds. It looks like I get a "100" twice within 40ms and then this "638" message 50ms later. Is this 638 message the network wakeup? I'm guessing there was a high-voltage wake-up in between the 100 messages, but how would I know for sure?

    I noticed chewtoy posted '641 01 FF FF FF FF FF FF FF' as a wakeup. This is different than the '621 01 FF FF FF FF 00 00 00' I've been using to date. I'll give it a try.

    Vitali, is there a way the obdlink mx can tell me about wake-up signals?
    Last edited by tripzero; 03-30-2012 at 06:20 PM.
    Former author of LinuxICE, nghost, nobdy.
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  6. #56
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    I've been searching the internet for the past couple weeks looking up GMLAN hacking and came across this thread. Lots of good information here! I'd like to edit a few things on my 2009 Pontiac G8 and just want to make sure I have the hardware correct first before I get any deeper. I have this PCI-CAN adapter already for my desktop, will this work since it already has the 120-ohm resistor built in? Just tap into the vehicle wiring?

    http://www.janztec.com/en/can-pcih.html

  7. #57
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    Quote Originally Posted by brentsten View Post
    I've been searching the internet for the past couple weeks looking up GMLAN hacking and came across this thread. Lots of good information here! I'd like to edit a few things on my 2009 Pontiac G8 and just want to make sure I have the hardware correct first before I get any deeper. I have this PCI-CAN adapter already for my desktop, will this work since it already has the 120-ohm resistor built in? Just tap into the vehicle wiring?

    http://www.janztec.com/en/can-pcih.html
    Unfortunately this adapter won't work with GM Single Wire (SW) CAN. You'll have to get something that support J2411. You adapter is for ISO 11898. These are two different types of CAN Bus. However the GM vehicle does have a ISO 11898 network as well. Its on the OBDII connector at PIN 6 (CANH) and 14 (CANL). The SW CAN is on PIN 1.
    Hack your car's CAN BUS at www.canbushack.com

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