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Thread: Carnetix Wiring Help Needed!

  1. #1
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    Carnetix Wiring Help Needed!

    I've got a carnetix p1900 with a mac mini.

    I have everything wired up and from what I understand it should turn the carnetix, screen, and mac mini on after turning the key to IGN and then turning off when I turn the key back.

    Currently, when I turn the key to IGN, the carnetix starts up but the mac mini does not start. The screen turns on but stays black I am assuming bc the mac mini is not loading.

    One quick question about the wiring... there are 2 blue wires coming from the carnetix, one on each connector. I currently have both going to my amp (P.Con). Should one of these be going to something else and if so to what? Could this cause my mac mini not to load?

    What wires should I begin looking at? I have the yellow connected to IGN, Red to battery, red and black to screen. There is a brown wire on one of the connectors that I currently cant see what it goes to, doesnt look like anything.

    I guess I should have waited to post this until I have the unit out and in plain sight so I can see everything, but any initial help or areas to look at would be appreciated!

    Thanks

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    Also, the mac mini turns on fine when I press the power button on the mini itself...

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    Are you using the Macpac wiring harness and if so, have you installed it inside the Mini?

    Also, I had this problem with a recent Mini install and the Carnetix 2140. Rereading the manual, I realized I did not set the jumpers properly to work with the iSense line in the Macpac harness. After setting the jumpers properly, it started immediately.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
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    Quote Originally Posted by Bugbyte View Post
    Are you using the Macpac wiring harness and if so, have you installed it inside the Mini?

    Also, I had this problem with a recent Mini install and the Carnetix 2140. Rereading the manual, I realized I did not set the jumpers properly to work with the iSense line in the Macpac harness. After setting the jumpers properly, it started immediately.
    I have the macpac harness... Inside the mini - are you talking about the very thin wires with the very small connectors? If so, yes.

    I personally did not splice/resolder the macpac, I purchased it already done... Should I look into the wires going into that?

    http://store.mp3car.com/MacPac_Power..._p/cbl-002.htm This looks tempting... For $30, I may just save me the headache.

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    I mentioned in my first post... I'm not sure if this is contributing to my problem, but I dont think I have them hooked up correctly.

    there are 2 blue wires coming from the carnetix, one on each connector. I currently have both going to my amp (P.Con). Should one of these be going to something else and if so to what?

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    The Blue wire on the OUTPUT side is for DYNON (IE connect it to your amp.)

    The Blue Wire on the INPUT side is a 12v Pulse sensing wire (instantaneous 12v).

    Basically, you could for example hook it up to your central locking. That way when the cnxp1900 sense 12v on the pulse input, it will start the mac in much the same way the IGN Line would.

    So in essence what is happening is this.
    IGN>CNX Turns ON>12v is applied to DYNON (amp signal)>DYNON sends 12v to the Pulse INPUT>P1900 Hangs.

    Basically it hangs because it is waiting for pulse to go back to 0v, which of course it wont because DYNON is a constant 12V

    Long storey short, DISCONNECT THEM IMMEDIATLY! You are probably confusing the hell out of the P1900 and causing it to fault.


    To quote Carnetix owners manual.

    4.2.1 What is a pulse?
    Voltage Pulse on Pin 1 of J1
    When connecting to Pin 1 of J2, the “pulse” must be a voltage that transitions from 0V to +V, and then transitions back to 0V. The SSC will wait (hang) if the voltage stays high without going back to 0V after the initial transition from 0V to +V.
    Link

    Do your research!

    ALSO double check your jumpers, iSense wiring and Macmini Switch wiring.

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    Agree with @Lachie, at least disconnect the blue wire on the amp that comes from the INPUT side of the P1900.

    That may or may not cause the problem you are seeing but I would double check the jumpers to make sure they are set for iSense.

    Looking at the P1900 manual, it states that if you have an earlier version of the P1900 (prior to v2.2) you have to use a resistor mod with an intel Mac Mini. Details on that mod are on the Carnetix forums here.

    Which brings up a different question we didn't ask - what type of Mini are you using? PPC, Intel, or one of the very newest Minis?
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

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    Ok. I am going to unmount everything so I can see everything clearly.

    I'll also disconnect the one blue wire.

    I don't have one of the newest minis. I am pretty sure it is a intel duo... It's running windows. I have v2.2 of the p1900.

    Here's a pic I posted in my proposed build thread... shows the mini if it helps.


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    I just re-read your original post and it doesn't appear that the Mini powers up at all -even when you press the power button on the Mini. Also, you have the LCD screen connected to the red and black wires and it works - or at least turns on, when you start the car.

    Since the Mac pac cable is shown in the photograph as having just the Mini connector and a brown, black and blue wire on it, I think you have connected your LCD to the red and black wires on the INPUT side of the Mini. You want to connect the LCD to the black (ground) and brown (secondary output) of the P1900.

    Disconnect the blue wires completely for now.

    Set the primary output to ensure that jp6 has NO JUMPERS on it at all. That is the 18 volt setting the Mini requires.

    Next, set the jumpers on jp5 for the secondary output to the 12 volt setting. Note the warning to move both jumpers together or damage will result.

    In addition, you need to set jp2 to 12 volts.

    JP 4 controls how the secondary output works. Set accordingly.

    When I set stuff up, I use a multimeter to check everything before connecting my equipment. If you don't have one, you really should get one and google a video of how to use one to measure voltage. Set up the P1900, turn the car on, and measure the output voltage on the Mini connector and on the secondary. The Mini connector should measure around 18 or 18.5. The secondary should read 12.

    If it does, you can safely connect your LCD and your Mini. Again, turn the car on and see if the Mini starts. If it doesn't, press the power button on the Mini. If the Mini starts, there's an issue with the iSense cable most likely.
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  10. #10
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    I forgot to mention it in my first post, but I posted it in my second post... the mac mini turns on and runs fine when I press the button on the mini itself.

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