Aftermarket backup camera connect to OEM navigation unit Video positive(+) / Video negative (-)?

Folks here who have skills in electronics (I know there are many of you ),

I have an aftermarket backup camera with 3 wires, RED (power), BLACK (ground) and YELLOW (video). The red and black are regular wires and the yellow is an RCA connector. Most of the cheap aftermarket cameras come this way, easy enough.

So looking at the wire diagram coming out of my OEM navigation I have 4 wires that need to hook up to the backup camera. I have Power, Ground, Video +, and Video -.

I'm scratching my head here ? What is video (+) and video (-)? Do I need to modify the yellow RCA video connector from the aftermarket camera to get it all connected properly? Thanks for any help you can offer.

 

Unfortunately it does not.

 

I was planning on doing spiderman's idea of just tapping into a female RCA jack, center being video positive, outer shield being video negative. Based on your knowledge, do you know off hand if the Yellow RCA cable has both positive and negative video? If so, do you think spiderman's idea will work?

Here is a diagram of the 4 wires that I am talking about. They are 4 wires located at pin hole 24, 23, 22, and 21 next the the 5 mic wires in the 24 pin rectangular connector near the bottom of the nav unit. The wires would normally connect to the OEM camera, but the OEM camera is $500+, I prefer the aftermarket cameras that are around $30

 

PICTURE 1 is the custom harness that holds the backup camera/microphone/OBD-II-BUS wires. From the wire side from left to right, the white/black stripe is POWER, solid black is VIDEO NEGATIVE, solid red is VIDEO POSITIVE, solid gray is GROUND.

Trying out spiderman's idea was a no go after connecting video negative (RCA shield contact) and video positive (RCA center contact) to the yellow RCA cable of the aftermarket camera however I still think it's the right way to do it after reading this thread on a different forum.

Another thing I noticed using a multimeter was that I was not getting any power coming out of the white/black stripe POWER cable from the wire harness when I was in reverse or even in park. I think I am missing something else that triggers the camera to activate.

PICTURE 2 from the nav diagnostics has always shown the "Camera Setting" grayed out.

PICTURE 3 shows the location where this cam/mic/bus wire harness plugs into (lowest part of the pic).

PICTURE 4 is verification from the nav diagnostics that I connected the reverse wire correctly as it shows change from off to on when I switch the car in reverse.

If anyone has the wire schematics for the 2010 Prius Navigation unit that they could share with me (my nav has a black metal casing if there is a difference) or can offer some tips or help please post or PM me please.

PICTURE 1:


PICTURE 2:


PICTURE 3:


PICTURE 4:

 

Yes, call me crazy but I acquired a used factory nav HU for cheap and very happy with my decision. I originally wanted to go aftermarket, but after fiddling with needed aftermarket adapters for the factory amp and steering wheel buttons, non matching aftermarket bezels, I was in the "meh" moment. Then realizing I would be also bypassing/wasting the factory integrated microphone over an aftermarket one, I was no longer interested. I tried installing a good priced Sony HU but it was DOA out of the box. I then looked into the high end kenwood but it was $$$ and the user interface had a bit of a lag with no signs of firmware update fix after reading a few reviews on the kenwood support forums. I then looked at the Rosen but for some reason it had a "cheap" feeling about it to me so didn't go that route.

So back to the used factory nav that I fitted, the existing microphone with voice command works great. I'm actually quite happy with the factory nav unit. I also like how it recognizes the JBL amp, DSP and all, how most of the major harnesses are plug-in-play, and of course the factory finish. Everything pretty much works except for the backup camera, hence the reason I created this thread.

Many people here on PC regret paying the money up front for the Prius nav package. Map disc upgrades, driving lockouts, and a plain navigation (lack of eye candy) and all, it's just not worth the retail price to many. Then you have the lazy extremist, the "just buy a freakin garmin and call it a day" crowd who hate factory nav or aftermarket period. I'm sure you have seen the dedicated thread of members bashing the factory nav. It's not the greatest unit but it's also not the worse. Bluetooth music streaming/calling, voice command are great, with a decent navigation and a clean factory look. I didn't purchase this at the retail price and the installation was free, I did it all myself.

Thanks for digging this up. But quickly looking over the pictorials, the wire harness does not look the same as the one I am talking about unless I am missing something.

I've already tapped into the reverse signal from the drivers side and verified that it works.

The white/black wire is a custom wire, not OEM, I only have partial diagrams and it is definitely the power wire.

Does anyone know where I can obtain the wire schematics for the factory nav? Any other tips to get the backup camera to recognize? I've tried resetting and reinitializing the nav via diagnostics menu, still a no go.

Thanks for the help!

 

Thanks for sharing your experience. I'll check that site out. I threw up in my mouth a little when I saw the $450 price tag for the navtool . Does anyone know where I can find this setup cheaper and has anyone actually installed one of these in their Gen3?