How to connect oem reverse camera wires to after market navi unit ?

Discussion in 'Gen 3 Prius Audio and Electronics' started by MSF1344, Dec 20, 2019.

  1. MSF1344

    MSF1344 Junior Member

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    Hi , I just removed my original sat nav unit and changed it with Xtrons unit which is the aftermarket. But the problem is the harness for reverse camera on original Toyota unit is different and the xtrons just have a normal RCA connection. I cut the original toyota harness and there is four wires but i dont know how to connect to the new navi unit . Please see the photo of the genuine harness which i cut it down .
     

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  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    The connector is unfamiliar to me, but that may be because it's a UK car. However, they seem to have used the same four wire colors that I see on the US models:

    Red is 6V+ to power the camera. Be careful! Your new head unit may only supply 12V for the camera, you'll need to add a regulator.

    Black is CV+ (RCA pin)
    White is CV- (RCA sleeve)

    Yellow is shield/ground.

    Again, that's IF they used the same wire colors as in the US models.
     
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  3. MSF1344

    MSF1344 Junior Member

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    Thank you for your quick reply , My car imported from japan to UK and I find out the UK version and US version are totally using different harnesses . so how to make sure the red wire is + and how to know what is the others ?
     
  4. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    Wish I could tell you. I understand that the wiring diagram for the JDM car is not available to the public.

    In the US version, those same four wire colors are embedded within a larger 24-pin connector that has other unrelated connections.

    About the best I could suggest is that you temporarily wire up the factory deck for at least power and then backprobe those four wires.

    If:

    1. the red gives ~6V over chassis ground earth
    2. you see around 1V between black and white
    3. continuity between yellow and chassis ground earth
    then I'd call it fully validated electrically speaking- you'd then further validate by adapting black & white to an RCA terminal and plugging into the display to make sure it's a video signal and not some other incredibly random voltage-of-the-right-level.
     
  5. MSF1344

    MSF1344 Junior Member

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    Sorry , can you explain it in easy way as I am not an expert electrician , so when I power the head unit how to check the voltage on the output socket ? With volt meter ?
     
  6. Elektroingenieur

    Elektroingenieur Senior Member

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    The diagrams are available (in Japanese, of course) on the Electronic Technical Manual (電子技術マニュアル) discs; see the PriusChat Wiki page. Note that the discs don’t typically cover dealer-installed options, which have separate instructions that can be more difficult to find.

    The rear television camera assembly (part number 86790-47040) listed in Toyota’s parts catalog for third-generation Prius cars built for sale in Japan is also the only one listed for U.S. and European models of the same generation, which strongly suggests that the voltage requirements (nominally 6 V) are the same, too.
     
  7. MSF1344

    MSF1344 Junior Member

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    Thank you for your reply and very helpful information , So i need a voltage retainer to connect to my aftermarket head unit which is feeding 12v .
     
  8. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    I used an Axxess AX-CAM6V regulator to solve this problem in a similar installation in my car. Very cheap and tiny, easy to wire. These are very generic, nothing special about them other than that this one is packaged for durable automotive use.

    To answer your earlier question- if you want to use a meter to validate what's on those four wires, watch a youtube video on the subject of backprobing and perhaps another on the topic of digital volt-ohm meters. It's not difficult, but it'll take you seconds/minutes to watch what would take me an hour to type.
     
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  9. MSF1344

    MSF1344 Junior Member

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    Thank you .
     
  10. Sam12169

    Sam12169 Junior Member

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    Please can you help me to make connection on my Prius 2017.
    I Hina installation android touch but reverse camera wires I need to connect. Please help me which wires to connect.
     

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