2014 Prius C One reverse camera cable knee panel

If you happen to find the reverse signal wire, please share. I tried to do the same thing some time ago, but gave up. I ended up making a switch that turned the rear camera on and off manually. Ideally I'd rather the camera be automatic.

 

Heya. My memory is all kinda of hazy since the rear view camera was the first mod I did when I got the car. I want to say that I stole 12v from the headunit, that was toggled and connected into the "reverse signal detect" input port. I just don't remember which one that is. From there, the corolla headunit would normally send 6v into the rear camera, but I wired the 6v to a relay activating 12v (12v probably also stolen from headunit) that fed into the camera in the rear. The 12v would power on the cheapo ebay camera and send the video feed into the video in into the headunit, via a RCA friendly harness I bought someplace.
At the time since I couldn't find the reverse signal, I figured I'd emulate one and feed that into the headunit.

I want to say that I found that guide that SwhitePC put up, and tapped pin28, brown cable, but had no luck. At the time I tested it was 12v in both reverse and D. I figured I did something wrong, or it didn't apply to my '14 model and went elsewhere. The guide mentions the brown, or purple cable to tap. Which wire did you tap to successfully get the reverse signal? Is the signal you get out of there steady, or is it a pulse?
Realistically I'd like to stick a diode on both my switch and the potential reverse signal wire to isolate both, so I can keep my camera switch that's currently in place. It's become useful for turning on the forward/rear camera for precision parking, looking to see how close that guy behind me came to hitting me, or being a snoop and reading license plates. I eventually set up the switch to allow ipod video in, but per the misses, a 2nd hand mini ipad eventually eclipsed the usefulness for the smaller headunit screen for AUX video in.

Related side project 1: Shortly after making sure the camera setup worked, I took the relayed 6v to 12v power, switched the 12v line via a SPDT ON/OFF/ON switch, and used that as a selector for powering the rear camera, or forward camera. The camera video feeds go into the headunit through a RCA Y connector. The SPDT switch could have been swapped for a DPDT for both 12v and video for a cleaner video signal, but I didn't care enough about that and DPDT switches are unusually twice as huge. Our dashboard space is already limited as it is.

 

I haven't pulled out my headunit to make sure, but after reviewing the corolla notes, pin2 on the 28pin connector looks very familiar. I remember I didn't have a proper female (dupont?) connector, so I bent the cable up and around the plug like how the guide mentioned. I believe I have the appropriate dupont connector now, so hopefully I can fix it up properly. I'll realistically get a chance to get behind my dash this weekend when I test out the purple cable While I'm in there I'll take a pic of the pin and port I used, stare a bit at the manual switch so I remember what I did, grab a pic and post those up.

Could have sworn I responded a few days ago, but my post went poof . Or I'm just insane..

 

I have a corolla/highlander type.
Closeup pic is this kind:

 

I figure at the time of those posts, there were far less salvaged nav units from wrecked Cs to use and the prices were higher. Strangest caveat with the Corolla/highlander headunit is it requires a custom dash adapter, or a modified dual din one. At the time of those posts they were able to get one made by another forum member who isn't active anymore, but I got a less fancier one from alibaba for $60.
With my headunit, I didn't get one with Sirius or HD radio, but I assume some could exist.

 

Heya. About to head outside to get inside my dash. I'm not sure if it's relevant, but I remember reading someplace that when the car starts up, the headunit sends an internal "you're in reverse now" signal and checks for an incoming video signal. If a signal is received, all the camera functions will be available. If no video signal is received, then the camera adjust options will not be there.
I confirmed this on accident one day when I started up my car and forgot I left the camera selector/power switch in the middle position, SPDT ON/OFF/ON.
If you haven't already, I'd give the camera power, ground, and video lines a once over just in case.

 

Got a few pics of the back of my headunit:

The 28 pin plug in the top right is the one with the reverse signal in, I used a yellow cable for that. That same yellow cable is also connected to a manual switch by the handbrake, fed by 12v from the headunit. I didn't double check, but likely the big fat red cable in the middle left of the pic.
The 16 pin plug in the top middle has video in and camera power. The top left and bottom left wires are video in and video ground, and the grey cable next to them in pin 7 is 5/6v camera power. The 5/6v feeds into a relay, that activates 12v and sends the 12v to camera.


Blurry blur pic of the 28 pin connector. To answer your earlier question, now that I can, I don't have anything in pin 9 or pin 10.

 

Hey. help please connect the camera. I have a standard Prius С music player. tell me where to connect the reverse wire and where to connect the video signal?