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Thread: How do I keep from powering off my carputer when I open the door?

  1. #1
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    How do I keep from powering off my carputer when I open the door?

    I am driving a Dodge Caliber and have my carputer psu hooked up to the ignition wire in my stereo harness. When I turn off the ignition it sends the pulse to my psu and starts hibernating. If I open the door before it is done hibernating it just powers off without finishing its hibernation. How do I fix that? This is my first carputer and I am learning as I go lol

  2. #2
    MySQL Error soundman98's Avatar
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    what is connected to the door that would cause that?

    where is your power wire coming from, and what type of power supply?

  3. #3
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    I can see this being a potential problem for me to when I do my install. Before your install would the stereo stay on when you turned off your vehicle and took your key out of the ignition until you opened the door?

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    Hey Dbarrett,
    I'm not sure what PSU you are using to power your CarPC, but it seems like you have it wired incorrectly.

    1. The 12v wire that powers your PSU should be a direct connection to your battery (Not the ACC (Accessory) 12v that it looks like you are using.
    2. The ground wire should be grounded to your chassis (just drill a hole and use a machine head screw attached to the black wire).
    3. The SIGNAL wire (remote wire) should be connected to your ACC 12v.

    So when you start your car, the ACC line becomes activated with 12v. This is connected to the remote wire of your CarPC PSU which tells it to turn on. It then uses the main 12V wire that is directly connected to your battery to power the PC.

    When you turn off your ignition and open the door, the ACC line looses its 12v, which signals the CarPC PSU to start the shutdown process. This will not instantly shut off the PC when you open the door.

    Hope this clears things up for you.

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    Quote Originally Posted by tmproff View Post
    Hey Dbarrett,
    I'm not sure what PSU you are using to power your CarPC, but it seems like you have it wired incorrectly.

    1. The 12v wire that powers your PSU should be a direct connection to your battery (Not the ACC (Accessory) 12v that it looks like you are using.
    2. The ground wire should be grounded to your chassis (just drill a hole and use a machine head screw attached to the black wire).
    3. The SIGNAL wire (remote wire) should be connected to your ACC 12v.

    So when you start your car, the ACC line becomes activated with 12v. This is connected to the remote wire of your CarPC PSU which tells it to turn on. It then uses the main 12V wire that is directly connected to your battery to power the PC.

    When you turn off your ignition and open the door, the ACC line looses its 12v, which signals the CarPC PSU to start the shutdown process. This will not instantly shut off the PC when you open the door.

    Hope this clears things up for you.
    I have the 12v constant ran directly to my battery, the ground to a ground and the 12v switched to the ignition wire in my radio harness. I think there is some kind of timer or something in the door, because when I turn of my ignition all in car electronics stay on for about 3 minutes or until I open my door.

    So what is happening is I turn my ignition off, it sends a pulse to my M4atx psu and starts the computer hibernating. If I open the door before it is done hibernating it is like it sends another pulse or something and shuts it off totally.

    Oh and I am using an M4 dc power supply that I bought from this site.

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    Quote Originally Posted by Tical84 View Post
    I can see this being a potential problem for me to when I do my install. Before your install would the stereo stay on when you turned off your vehicle and took your key out of the ignition until you opened the door?
    Yes, the radio would stay on until I opened my door, or about 3 minutes passed and then it would turn off on its own.

  7. #7
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    Quote Originally Posted by soundman98 View Post
    what is connected to the door that would cause that?

    where is your power wire coming from, and what type of power supply?
    Not sure what is connected to the door. All electronics in my car work after I shut off the ignition and pull the key out, until I open the door or about 3 minutes pass and then everything shuts off.

    Power wire is going directly to my battery.

  8. #8
    What can I say? I like serial. Curiosity's Avatar
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    With a DMM, what voltage are you reading on the main power wire to the PSU when opening the door? And where is the power wire attached?

  9. #9
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    You need to make sure that your 12v constant is still getting power after you open your door. It's not possible to send a 2nd signal to the PSU to instantly power it off.

  10. #10
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    Quote Originally Posted by Curiosity View Post
    With a DMM, what voltage are you reading on the main power wire to the PSU when opening the door? And where is the power wire attached?
    I just checked and I'm reading 14.1-14.2 volts constantly on the wire going to the battery. I am reading the same voltage on the ignition wire with the ignition on. With it off, I'm reading 0. Could a bad ground be causing this? The computer will randomly hibernate while I am driving, like the power button was pushed. So I thought that the voltage was dropping below the 11.7 or whatever the M4 shuts down at. It isn't though, because I had the multimeter hooked up when it randomly hibernated and my voltage was still constant at 14.1 volts....

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