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Pull video from backup cam

Discussion in 'Gen 3 Prius Main Forum' started by CookieGuru, Nov 22, 2017.

  1. CookieGuru

    CookieGuru Member

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    Vehicle:
    2013 Prius Plug-in
    Model:
    Plug-in Base
    My dad wants to install a pair of cams in his 2015 and I'm curious if it's possible to pull the video from the factory backup cam. We're looking at dash cams that have a composite input for a second camera. I'm curious if it's possible to tap in to the factory backup cam meaning we wouldn't have to put a second camera on the back of the car and run a wire all the way around.

    I installed a button on the dash of my Gen II to turn on the backup camera at any time so I'm aware of how much of a pain this will be to rip out the head unit.
     
    #1 CookieGuru, Nov 22, 2017
  2. Elektroingenieur

    Elektroingenieur Senior Member

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    Vehicle:
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    Three Touring
    I seem to recall reading here that the Rear Television Camera Assembly does produce a composite NTSC video signal. Since it’s Japanese, it might have zero setup—I’ve never looked at the signal on a waveform monitor or oscilloscope. Here are two issues to consider:
    • Multiple termination could be a problem. Video signals are traditionally terminated into a 75 Ω impedance, and if the car’s built-in display and the input connector on the add-on camera both provide this termination, the picture will be too dark. In television studio plants, the usual solution is to buy equipment with high-impedance (loop-though) inputs or to use a distribution amplifier.
    • You may need to provide a continuous six-volt supply for the camera; depending on which version of the radio head unit you have, it may provide power for the camera only when the car is in reverse.
    Toyota’s Electrical Wiring Diagram, with the details of the wiring and connectors, is available by subscription to techinfo.toyota.com.
     
    #2 Elektroingenieur, Nov 22, 2017
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