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Thread: In-dash VGA Motorized wiring problem

  1. #1
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    In-dash VGA Motorized wiring problem

    Hi all,

    I'm hoping someone can assist. I installed a SP-716 into my dash last night and it is working fine. However, when I turn on the headlights, the screen retracts. Any idea why this might be? I probably crossed some wires or something, but I'm wondering if anyone else has seen this behaviour.

    Thanks,
    Grapas.

  2. #2
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    sounds like you've already figured it out - double check your wiring and your voltages
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  3. #3
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    what is your car?? some european cars have multiplex wirig which can be very tricky (cables do not submit electricity but electric msgs)

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    I have a Jetta. I figured it might be something like that, but I've never seen "turn on headlights" equal "power off--retract screen".

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    it could be a wiring problem i guess. is there a cable in your LCD that is supposed to make it retract if +12volt is removed?

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    the funny thing is that when i had me K301 on my bench for testing i left the pc working alone and decided to watch some TV when i changed the TV station using my TV's remote control the LCD retracted...))) it was using the same Infra red frequency lol... it scared the **** out of me

  7. #7
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    Yeah, it's supposed to retract when the ignition key is removed/12 volts out. And it does. It just also does it when you turn on the headlights. Kind of funny, actually. I wonder if turning on the headlights is supposed to send a signal t the head unit to do something...

  8. #8
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    two things i would suspect..
    1. what you suggested.. the turn on headlights used to send a msg to illuminate perhaps the headunit?? (if this is the case then i reccomend you to remove this cable from your lcd.. playing with multiplex "technology" is veeeery expensive..damage to the cars ECU)

    2. there is a voltage drop in your car when you turn your headlights and the lcd considers that an ignition off.. (this can be checked using a multimeter on your battery while car is running) but again voltage when car is running should be 14 volts since the alternator is providing the voltage then..(unless you have an alternator problem!)

  9. #9
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    Awesome, thanks much! This my first install, and while I'll be the first to admit it's a bit weak, there's a certain level of functionality it needs.

  10. #10
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    Quote Originally Posted by grapaslingo
    Awesome, thanks much! This my first install, and while I'll be the first to admit it's a bit weak, there's a certain level of functionality it needs.
    Actually, checking the voltage at the battery should probably be more done at the end. Check the actual wires that are providing power and ground to your unit first, with and with out the lights on. Perhaps you have found a wire that changes states for some odd reason when the headlights go on. It can happen, but it is rare. If you see a wire that changes states, or voltage drops on, try finding another wire that will keep the proper state the entire time.

    IF YOU CAN NOT, then check the batery and alternator. No need to check them first, especially if you are not having other problems, like starting after the car sits for a while, or dimming lights when you turn on the turn signals, or dash lights fading with the turn signal, or something like that.

    Good luck,
    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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