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Thread: little electric problem for reversing

  1. #1
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    little electric problem for reversing

    hi,
    i have lilliput 629 with trigger cable for reverse cam. it was running perfect for couple of months then it start to trigger when i brake.
    however there is little impulse when i brake so it goes av and back to pc simultaneously for once. i guess i have problem with my trucks taillight. i will solve it next service day.
    during this period, iwant to make a delay circuit that eliminates the impulse from the brake light. i ve googled some and find a circuit with rc,relay, diode.
    it is little complex for me so i wonder if i can make delay with simple rc circuit.

  2. #2
    MySQL Error soundman98's Avatar
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    you could try to either add some diodes in-line with the wire, or possibly try a 1k ohm resistor to reduce the surge..

  3. #3
    Variable Bitrate mayhembdm666's Avatar
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    Where did you connect the wire itself? to the reverse lights or the reverse switch itself??

    This should not be happening unless your getting a cross feed or something happening, I would disconnect the monitors wire and reconnect it just to check/test as could be a something simple that is causing it.. Then wire it up with either a relay or something.. Also have you fused that wire? I know some people dont like to... but some have learnt the hard way by not doing so.
    2004 Holden WL Caprice Auto GENIII
    Base System = Raspberry Pi
    Everything else is pending for now as switched from a Mini-ITX setup

  4. #4
    MySQL Error soundman98's Avatar
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    i remember seeing this issue before, i believe that most solved it by installing a relay to trigger the the reverse wire..

    it is just part of integrating with the cars wiring-- some cars are just funky like that..

  5. #5
    Variable Bitrate mayhembdm666's Avatar
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    I can understand some vehicles are just ... well not common sense wired..
    but to have a vehicle where the brake itself triggers the reversing circuit? That would mean in mine things like the mirrors adjusting to a pre set for reversing any time i tap the brakes.

    So by using a relay it would be counting on the relays switch time? just seems a little uneasing that it would work in that way... But such is technology
    2004 Holden WL Caprice Auto GENIII
    Base System = Raspberry Pi
    Everything else is pending for now as switched from a Mini-ITX setup

  6. #6
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    It's often connections - the increase resistance hence higher voltage spikes (despite less current).
    R&R'ing connections and bulbs etc often fixes the problem till next time.

    Hence why many prefer using a relay (using fused power from the battery),

  7. #7
    MySQL Error soundman98's Avatar
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    Quote Originally Posted by mayhembdm666 View Post
    So by using a relay it would be counting on the relays switch time? just seems a little uneasing that it would work in that way... But such is technology
    kind of-- the relay's coil is going to be less sensitive to tiny variations in voltage(the physical switching can play a very small part in that), where the reverse wire input on the lcd can be extremely sensitive..

  8. #8
    Variable Bitrate mayhembdm666's Avatar
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    Ok, so the issue at hand is more the actual signal wire vs the vehicle itself.
    2004 Holden WL Caprice Auto GENIII
    Base System = Raspberry Pi
    Everything else is pending for now as switched from a Mini-ITX setup

  9. #9
    MySQL Error soundman98's Avatar
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    i would say it is half-and-half..

    the lcd shouldn't be that sensitive, and the car shouldn't be outputting any amount of voltage on that wire unless you are shifting past reverse..

  10. #10
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    thanks everyone for your answers

    Quote Originally Posted by mayhembdm666 View Post
    Where did you connect the wire itself? to the reverse lights or the reverse switch itself??

    This should not be happening unless your getting a cross feed or something happening, I would disconnect the monitors wire and reconnect it just to check/test as could be a something simple that is causing it.. Then wire it up with either a relay or something.. Also have you fused that wire? I know some people dont like to... but some have learnt the hard way by not doing so.
    i had the wiring done by the one who setup my rear camera. so when this occurs i re check the wiring if there is leakage or sth. it is connected to reverse light wire near the camera. but it is not the wiring.

    Quote Originally Posted by soundman98 View Post
    you could try to either add some diodes in-line with the wire, or possibly try a 1k ohm resistor to reduce the surge..
    first i will try resistor if not, i will connect small button to my gear knob so i can change the screen when i need reverse cam. i dont need it everytime and since my truck is automatic i have to select R when going from P to D.(in my opinion the tiny relay like thing in my controller board had burnt because of too many on and off)

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