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Thread: OEM GPS mod. Writeup + Pics

  1. #1
    FLAC IntellaWorks's Avatar
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    OEM GPS mod. Writeup + Pics

    Alright here we go, ya'll asked for it so here ya go. Hopefully this write up will better explain how OEM GPS modules are easily embedded into the CarPc setting. Questions / Comments please P.M. me.


    Basically, I took the OEM GPS mod and baught the ribbon cable. Then soldered 4 wires to the ribbon cable. (I protected this soldering with elec. tape because the ribbon's pins are VERY tiny and the solder job was very fragile)

    If your planning on doing this, a very fine solder and thin soldering iron is needed.

    Once the wires we're soldered, I connected them to the system board to thier respective locations. (You'll see pin outs and images with the images attached below)

    From here I found a good location to mount the GPS mod. in my case, keep in mind when mounting you'll need to account for the antenna, which will attach to the GPS mod itself, so where ever you mount the MOD make sure there is a hole nearby. My Garmin15L has a very tiny antenna connector, aligning the GPS mod to the hole to the outside (for the antenna) was the hardest part of this project.

    I couldn't get pictures for the mount because it was simply too small. Here's how I did it. The Garmin 15L has 4 mounting holes, I used only one to mount it vertically. I went to a local hardware store and baught a thin and long screw with (lock nut and bolt) (the screw is one size smaller than 6-32, for your guys that know anything about screws) I also baught a nylon spacer, and made sure that it was big enough for the screw to go through. I Epoxied the nylon spacer to my OEM gps mod, then screwd a hole in the side of my case... From here I simply inserted the screw and tightened it.

    Once everything was in place, I cleaned up my wires and doubled check to make sure I hadn't crossed my power wires. (This is essentia)l because if you'll notice the diagram on how to connect the GPS you'll notice it calls for a 1A fuse... I didn't bother because I'm positive that the 3.3v line on my MOBO will never increase, but if your setup is like mine and you cross a wire w/o a fuse you'll blow your GPS mod and possibly ruin the system board.

    Now that everything was connected and pretty I powered the system up and ran the GPS diag. Tool from Delu Electronics (free download, see original OEM GPS Modules thread) and I was able to see that my GPS mod was collecting NMEA 1.83 data... YAY!

    EDIT: After reinstalling a nLited version of windows XP my mouse began to respond irratically, at first I thought that I had an IRQ conflict but after doing hours of research I found the solution.

    Windows may think that your OEM GPS mod is a serial trackball mouse. You can check this by going into the "device manager" if you see more than one mouse then it is likely that you have this problem. Here is how to solve it.

    If you have a garmin 15L/H oem engine then please remember that it has an internal battery that can last up to 21 days so just unplugging the power will not stop it from transmitting to your system, you must unplug the "Data in" wire from your system board to get the mouse to stop going nuts. From here, run an advanced search for "sermouse.sys" and rename it to "sermouse.BAK.sys" reboot the machine and head back to device manager and uninstall the trackball mouse. Reboot the machine again and in mouse/other devices you should now see "Unknown Device" your done..



    -Good luck with your installs !
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    Progress [I will seriously never be done!]
    Via EPIA MII
    512MB RAM
    OEM GPS (embedded)
    nLite WinXP pro on
    1GB Extreme III CF card
    Carnetix 1260 startup/ DC-DC regulator
    Software: Still, re-Writing my existing front end in .Net

  2. #2
    MySQL Error jcdillin's Avatar
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    and mine is the same except i'm powering mine from 5volts and if you buy the 15L-W you will get wires instead of the tiny little ribbon cable.
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  3. #3
    MySQL Error scott_fx's Avatar
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    this is awesome, thanks!
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  4. #4
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    That screw size would most likely be a 4-40. Gotta love working at a hardware store.

  5. #5
    Newbie hklomann's Avatar
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    i would like to add the garmin configuration software downloadlink:
    http://www.garmin.com/support/downlo...ils.jsp?id=241
    or
    http://www.garmin.at/SW_downloads/snsrcfg.zip
    or
    http://www.garmin.com/products/gps15h/ then go to download and agree ...
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  6. #6
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    Here is my interface PCB for my Trimble Lassen SK2 module. Has power, 3V battery backup, and MAX232:
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  7. #7
    FLAC edrex's Avatar
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    Thanks for the write up!!
    I am looking at how to install on my mobo and I can't find the SMBus that you used to power the GPS. Is there another way to get the 3.3V to the mod? Sorry if this is a really stupid question, but this is all pretty new to me.
    Also, did you solder straight to the COM port on the Mobo? Is there a way to use an adaptor so if I make a mistake, I don't mess up my hardware?
    Thanks.
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  8. #8
    Variable Bitrate
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    the atx PSU provides 3.3V
    Mazdaspeed Car Computer
    gotta redo it all

  9. #9
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    It's better to use a battery, because once backup power is cut the ephimeris and almanac is loat and it could take up to 45 mins to get a fix

  10. #10
    FLAC IntellaWorks's Avatar
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    Quote Originally Posted by edrex
    Thanks for the write up!!

    I am looking at how to install on my mobo and I can't find the SMBus that you used to power the GPS. Is there another way to get the 3.3V to the mod? Sorry if this is a really stupid question, but this is all pretty new to me.
    Also, did you solder straight to the COM port on the Mobo? Is there a way to use an adaptor so if I make a mistake, I don't mess up my hardware?
    Thanks.
    Your welcome ! hope this truely helps !!!

    1.) yea you can get 3.3v from the ATX power supply but you'd have to tap into a wire.

    2.) If your using a garmin 15l then keep in mind you can use a 5v as well so if you have an internal USB connection you can use that or even a floppy connector.

    3.) I didn't solder to the mobo, you never want to "permanatly connect" things with this hobby no matter how confident you are.

    4.) I baught these little wire connectors that basically splice into the wire and has a jacket that goes over the metal pin on the com port. anyone know the technical term for this, wish I knew the name of the part...

    5.) Look into the OEM GPS Garmin 15L WIRED version from www.gpscity.com that will minimize the soldering. This little guy wasnt available when I started doing this but boy do I wish it was !!!
    Progress [I will seriously never be done!]
    Via EPIA MII
    512MB RAM
    OEM GPS (embedded)
    nLite WinXP pro on
    1GB Extreme III CF card
    Carnetix 1260 startup/ DC-DC regulator
    Software: Still, re-Writing my existing front end in .Net

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