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Thread: Trouble w/onstar tapped GPS & IG.

  1. #1
    Variable Bitrate Viscouse's Avatar
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    Trouble w/onstar tapped GPS & IG.

    Well, I'm at the end of my rope trying to troubleshoot this install so I turn to the experts.

    Setup: IG v2.1.0
    Onstar tapped GPS module exporting (I think) NMEA data.
    Serial cable into port1 of my M10k

    Problem: While I think the onstar Box (OB) is exporting valid data, IG doesn't seem to like it, ergo, no lock, no nav.

    Steps taken:
    -tried different bauds, ports, cables, checked wiring, validity of COM ports.

    When I use a GPS test program VisualGPS It seems to think I have a lock, and knows my position. But, it can't tell me my signal strength or # of sats. ?

    When I fire up IG & ask it to find my GPS, it does so correctly. But doesn't get a lock (red arrow) or move when the car moves. GPS info reports all dead (no sats or time/speed/altitude). BUT, the NMEA window is alive with text, refreshing like twice a second.

    Here's the odd thing. If I fire up IG I get the above. Close IG & fire up VisualGPS & close it, then fire up IG again, this happens:
    1: See picture below. Sats say 7/0 (what's that mean? I'm using 7 of 0 existing sats? Manual says nothing about this).
    2: NMEA still says it's getting data from the OB.
    3: Nav arrow's green, but still doesn't move when car moves. Data doesn't change either.

    Lastly, I'm using the assumption I'm getting valid data, which may not be the case. Can someone look at the dump & tell me if it's valid?
    Code:
    I'm an idiot, see post #9
    I don't know if I have bum data, or a bum IG, or both.
    Attached Images Attached Images  
    You know you want to...Worklog
    Enjoying v1.0 since it's operational. Aaaawww yeah.
    Specs: Opus120; Epia M10k; 700IDT; GlobalSat BR-355; iGuidance 2.1 & IGMod; XM; Custom case.
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  2. #2
    Variable Bitrate Leddy's Avatar
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    It's been a LONG time since I used my Onstar GPS so I can't remember the answers to some of your questions.

    However you might want to become familiar with NMEA sentences. GPGSA tells you the # of Active satellites, GPGSV will give you their coordinates. As you can see you do not have that sentence.

    I also think the Motorola format was Binary. I used the Winoncore software to switch to/fro NMEA. Here is a good link on NMEA sentences that should get you started
    http://www.commlinx.com.au/NMEA_sentences.htm

    Ultimately my TTL converter died and I decided to purchase a new USB SirfIII chipset vs the Motorola SirfII.

    GL
    2001 Pontiac Grand Prix GTP Sedan (Sold)
    2007 Scion tC
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    http://www.cardomain.com/id/leddy

  3. #3
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    Quote Originally Posted by Viscouse
    Problem: While I think the onstar Box (OB) is exporting valid data, IG doesn't seem to like it, ergo, no lock, no nav.

    Steps taken:
    -tried different bauds, ports, cables, checked wiring, validity of COM ports.
    The first thing that comes to mind, does the software parse using the commas for finding the fields or does it parse using static string lengths? We had a similar issue with a device I'm currently helping update. The original firmware used NMEA spec 1.5 and we were using static string lengths to find the fields. When the spec was updated, the fields became longer and the static string no longer worked because the software was only looking for a certain number of characters and adding just one character threw it right off.

    When I use a GPS test program VisualGPS It seems to think I have a lock, and knows my position. But, it can't tell me my signal strength or # of sats.?
    To bad the onstar doesn't output $GPRMC. This is the most versatile and useful string to give you the valid/invalid flag, speed over ground and more useful data. In a $GPRMC string: "V" = Invalid and "A" = Valid (yeah I know, makes so much sense!) Looking at the dump you have posted, I see the "$GPGSA,A,3,27,03,13,29,19,08,11,,,,,,01.9,01.2,01 .5*02" and I THINK that the A stands for valid in this string, just as it does in the $GPRMC string.[/QUOTE]

    I don't know if I have bum data, or a bum IG, or both.
    For now, I would think its ok. Another thing is the software you are trying to use might be looking for either the $GPRMC or $GPGGA strings and if that is the case, the onstar will never work unless you can get it to spit out the/those specific string(s).

    If you are interested, on my webpage I have a map out of the $GPRMC string to explain the fields at http://www.ke4nyv.com/gpsstuff.htm

  4. #4
    Variable Bitrate Viscouse's Avatar
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    Thanks for your help guys! I analyzed a huge chunk of data (4 MBs worth of NMEA dump) and found the following sentances:
    $GPRMC appears to be valid & moving
    $GPRMB Garmin Proprietary?
    $GPGGA appears valid
    $GPGSA appears valid, does find different satellites
    $GPGSV appears valid
    $PGRME Garmin Proprietary?
    $GPGLL appears valid, coords are moving.
    $PGRMZ Garmin Proprietary?
    $PGRMM Garmin Proprietary?
    $GPBOD Garmin Proprietary?
    $GPRTE Garmin Proprietary?

    So I think I have all the requisite data. Now I'm stuck again.

    Another bit of info is that it appears to be a Sony chip (verified) in a Garmin module (unverified) manufactured by Delphi (verified). I have the spec of the chip which says it complies to NMEA-0183 version 3.01.

    Anyone have any more ideas?
    You know you want to...Worklog
    Enjoying v1.0 since it's operational. Aaaawww yeah.
    Specs: Opus120; Epia M10k; 700IDT; GlobalSat BR-355; iGuidance 2.1 & IGMod; XM; Custom case.
    Witty one-liners currently quoted by (0001) mp3car.com forum member sigs.

  5. #5
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    Quote Originally Posted by Viscouse
    Thanks for your help guys! I analyzed a huge chunk of data (4 MBs worth of NMEA dump) and found the following sentances:
    $GPRMC appears to be valid & moving
    $GPRMB Garmin Proprietary?
    $GPGGA appears valid
    $GPGSA appears valid, does find different satellites
    $GPGSV appears valid
    $PGRME Garmin Proprietary?
    $GPGLL appears valid, coords are moving.
    $PGRMZ Garmin Proprietary?
    $PGRMM Garmin Proprietary?
    $GPBOD Garmin Proprietary?
    $GPRTE Garmin Proprietary?

    So I think I have all the requisite data. Now I'm stuck again.

    Another bit of info is that it appears to be a Sony chip (verified) in a Garmin module (unverified) manufactured by Delphi (verified). I have the spec of the chip which says it complies to NMEA-0183 version 3.01.

    Anyone have any more ideas?
    I found this online. Is this what you did. http://members.cox.net/onstar/

    There is a RS to TTL converter needed. He also has links to a program to poll the unit, and change it from Motorola to NMEA.

    Perhaps that will help you some.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  6. #6
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    Also, not sure if this applies to you, but I just read in this thread Onstar hack 2001 Yukon XL that the 2003 Yukon has a different board, SOOOOOO, so it is possible that the one you have (assuming it is in the Saab in your sig) is different and may not work correctly.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

  7. #7
    Variable Bitrate Viscouse's Avatar
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    Uh, no disrespect, but I already have verified that my tap is exporting valid NMEA data. If it didn't work, I wouldn't even have that.

    I know my board is different, and have made the correct modifications. My issue is why IG isn't reading the data.
    You know you want to...Worklog
    Enjoying v1.0 since it's operational. Aaaawww yeah.
    Specs: Opus120; Epia M10k; 700IDT; GlobalSat BR-355; iGuidance 2.1 & IGMod; XM; Custom case.
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  8. #8
    Variable Bitrate Viscouse's Avatar
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    Well, I'm even more confused than before. Concrete data has in fact, told me nothing.

    I emailed iNav to get their take on it. Apparantly, IG required the following sentences:
    GPGSV1~3, GPGSA, GPGGA, GPRMC, GPGLL.

    I am sending all of those.

    WHY WON'T THIS WORK!!!!!!!!!!!!!! ARGGG.

    Does anyone have a serial GPS module I can borrow? I'll pay shipping. I'm getting a little desperate.
    You know you want to...Worklog
    Enjoying v1.0 since it's operational. Aaaawww yeah.
    Specs: Opus120; Epia M10k; 700IDT; GlobalSat BR-355; iGuidance 2.1 & IGMod; XM; Custom case.
    Witty one-liners currently quoted by (0001) mp3car.com forum member sigs.

  9. #9
    Variable Bitrate Viscouse's Avatar
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    I'm a tard...but haven't fixed the problem.

    OK, I found 1 more thing out...I copied the wrong data. The data I thought was valid was from a sample file.

    The sentances I am ACTUALLY GETTING are:
    $GPGGA $GPGSA $GPVTG $GPZDA $PEXT $PSLT

    So since
    Quote Originally Posted by Viscouse
    IG requires the following sentences:
    GPGSV1~3, GPGSA, GPGGA, GPRMC, GPGLL.
    I guess this means I can't use IG.
    You know you want to...Worklog
    Enjoying v1.0 since it's operational. Aaaawww yeah.
    Specs: Opus120; Epia M10k; 700IDT; GlobalSat BR-355; iGuidance 2.1 & IGMod; XM; Custom case.
    Witty one-liners currently quoted by (0001) mp3car.com forum member sigs.

  10. #10
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    Quote Originally Posted by Viscouse
    OK, I found 1 more thing out...I copied the wrong data. The data I thought was valid was from a sample file.

    The sentances I am ACTUALLY GETTING are:
    $GPGGA $GPGSA $GPVTG $GPZDA $PEXT $PSLT

    So since

    I guess this means I can't use IG.

    Or, you can't use the built in onstar. I would prefer to pay for a USB GPS and use IG over using another Navi program with the On-star, but to each his own.

    It seems that the on-star isn't actually outputting standard NMEA data (since IG works with any standard NMEA gps unit). Perhaps there is a program that you can connect to the on-star gps, or a jumper etc. that can change it to standard NMEA.

    What is the part number, model number, and any other info, of the on star unit, perhaps we can find something for you.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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