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 Post subject: Re: Back up camera?
PostPosted: Mon Dec 07, 2015 10:26 am 
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Joined: Thu May 14, 2015 5:19 pm
Posts: 45
Location: Torrance, Ca
Awe man !! OSX, IOS, Linux, Android, Arduino... anything but windoz. And 2006 CE :cry:

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 Post subject: Re: Back up camera?
PostPosted: Mon Dec 07, 2015 3:26 pm 
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Joined: Sat Jan 10, 2015 12:16 pm
Posts: 94
Location: 2015 Spark EV, NorCal
Folks, be careful here. I'm as embarrassed as you are by the fact that our head units really run Windows CE, and there's a lot you can mess up there; At least a few Russians have bricked their head units after I releasted the Developer Mode pw. I feel really bad about that, please be careful; I've hacked other head units before and had great succeess, though I never ended up with a truly safe solution like I have in previous endeavours.

GTPprix is clearly a talented reverse-engineer, well-versed in the ways of IDA Pro (and then some). I'm sure he offers a fine service and it seems to put a roof over his head. Good for him. I have an unrelated day job and I'm motivated more for the fun of it and enjoy sharing my work with other people, but to each his own. I've bought a few junkyard-car head units -- no, they don't work in the car due to antitheft, but I'm working on that -- and I'll try to keep you guys posted on what I learn, because that's the way I like to work.

Cheers to all,
-solder


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 2:34 pm 
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Joined: Thu May 14, 2015 5:19 pm
Posts: 45
Location: Torrance, Ca
I finally got around to working on this again. I've mounted the camera and routed the camera wires to the back of my 2014 Spark head unit. Routing through the rubber accordion between the rear door and body was the funnest. I could only find an incomplete link on the wiring.
I need the following pin numbers:

video input
ground
12V
SWCan

and maybe:
video ground?
SWCan ground?

I think all the signals can be had on this connector.
Image Image

I plan on clipping onto existing wires where possible and finding contacts somewhere for the rest. Any idea on which cars I can cannibalize contacts from? Haven't been to a junkyard in years. Doubt they have any Sparks. Can I get these from the dealer?

thanks


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 2:42 pm 
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Joined: Sat Jan 10, 2015 12:16 pm
Posts: 94
Location: 2015 Spark EV, NorCal
You can buy the contacts from Mouser, http://www.mouser.com/ProductDetail/JST ... GfSw%3D%3D

Video input +: pin 7
Video input -: pin 8
SWCAN: pin 28
Signal ground: pins 17, 22
Ground: pin 38
+12V: pin 44

Have any tips and tricks for routing the wiring? I got stuck on that pretty quickly....


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 3:08 pm 
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Joined: Wed May 29, 2013 12:00 am
Posts: 536
Location: Portland, OR
I installed the GM Spark rear camera kit, which included a new harness to run from the head unit to the rear hatch. It was a real PITA and took way longer than I thought! I also learned that the GM harness going from the rear hatch hinge to the rear license plate area routes inside the hatch around the glass, which makes perfect sense. What doesn't make perfect sense is that there is a single wire harness clipping point that you can't get to unless you remove the rear glass, which is glued in, of course. Ultimately, I was able to remove my old harness and install the new one with the kit with a LOT of effort. I had to de-pin one of the larger connector bodies IIRC to get it installed without removing the rear glass.

If I were to do it again, I would definitely not do it the way I did it the first time. It would probably be much easier to get some multi-conductor wire that is appropriately small gage and route this along the stock harness and terminate the wires afterwards. If I ever try this again and figure out a decent way, I'll try to put together a tutorial because it's a real PITA the way GM designed the hatch harness and glass.

Bryce


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 3:43 pm 
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Joined: Thu May 14, 2015 5:19 pm
Posts: 45
Location: Torrance, Ca
solder,
Thanks for the quick reply. My best tip might be hard to come by. Found it in my garage. I used 3ft long .065dia. aluminum welding rod to probe possible
routes and then pull the wire through. This wire is really soft so it won't scratch paint or insulation. It is stiff enough that you can jam it forward and it will arch around obstacles ect. You can bend the end in such a way that when you rotate the other end it will swing around hopefully past the hole your trying to get to next. Once you get it to the next opening you can either hook the end to pull a loop of string back out or tape string to it to pull through.

Roughly I did this:
1. Pulled off little ~3X3 panel in driver side of lift gate.
2. Bent aluminum wire in kind of a big arch, taped string to front and shoved in camera-license light hole.
3. Looking through panel hole, hooked the string with another aluminum wire.
4. Pulled string, then camera wire with RCA plug through.
5. Connected the 12V and video wire to the special power RCA wire that came with the camera. Wrapped the connector in foam and tape so it won't rattle and tie wrapped next to the panel opening.
6. Cut off the RCA connector at the other end of the special wire because it will need different termination anyway and gets caught on everything.
7. Pulled accordion rubber thingy out of lift gate and slid to left as far as possible.
8. Pushed aluminum wire up along glass to hole above. At first I though coming out near the glass might help but abandoned that and went all the way to the accordion hole. Pulled string back, taped to wire and pulled wire through. Seemed like this would be impossible, but I managed to do it twice as the string came off once. If you bend the aluminum slightly in the right directions it's actually pretty easy.

Next.. Tricky part next.


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 3:56 pm 
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Joined: Thu May 14, 2015 5:19 pm
Posts: 45
Location: Torrance, Ca
solder,
Is the Video input -:pin 8 just ground?

There are only 3 wires on the camera wire harness 12V, video and ground. Did you use that for ground of one of the other grounds?

Mike


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 4:30 pm 
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Joined: Sat Jan 10, 2015 12:16 pm
Posts: 94
Location: 2015 Spark EV, NorCal
bicycleguy wrote:
solder,
Is the Video input -:pin 8 just ground?

There are only 3 wires on the camera wire harness 12V, video and ground. Did you use that for ground of one of the other grounds?

Mike


I think my camera had a separate video -, but connecting pin 8 to ground *should* work.


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 4:48 pm 
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Joined: Thu May 14, 2015 5:19 pm
Posts: 45
Location: Torrance, Ca
Here's the part I had the most fun with:

Image
You can see the black video/power wire coming out of the hole sloping downward to the right at an angle. The aluminum welding rod guide wire is shoved through the accordion and about an inch out the left side. This was relatively easy to do. The hard part was that I couldn't seem to pull a string or later the video wire through. The string or wire kept breaking or detaching.

Turns out you have to be very careful to keep the guide wire all the way to one side and not let it mingle through any of the wire bundle. If you do the wire will get grabbed by the wire bundle, kind of like a Chinese finger trap toy. The more you try to straighten it out or pull, the harder it grips.

Talcum or baby powder dumped liberally will help tremendously but you must avoid looping the guide wire through the bundle wires.


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 Post subject: Re: Back up camera?
PostPosted: Mon Jan 11, 2016 5:00 pm 
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Joined: Thu May 14, 2015 5:19 pm
Posts: 45
Location: Torrance, Ca
The rest was easy, but a little scary as your pulling apart the interior of your new car. :( Unclip the bottom and pull out the quarter panel a little. You don't need to remove it.

Image
I was able to just shove the video cable into the top accordion quarter panel hole and it started showing up as seen in the picture above by my finger.

Image
After pulling off the trim pieces routing the rest of the way is straight forward.


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