s that are not extended through the tailgate harness. Four are in a square arrangement, and the 5th next to the square. The 4 in a square are Red and white (camera power), and black + Black (video signal). The black wire beside the square is the video trigger for the NAV to backup (ground it). If you get the video signal polarity backwards, it won't give a picture on the NAV. Tried it both ways, and used an old VCR for test video so as not to risk damage to the new camera.
This picture shows the black and black video signal wires I used in the body harness side behind the right rear quarter panel.
The red and white wires are right below it in the square arrangement. They are factory camera power, unused for my aftermarket DVR camera.
I installed $20 backup camera today to my 2013 SL but took much longer than I expected because above description wasn't accurate or my car had no 12v power from red and white wires. I spent several hours trying to figure out and rule out power or camera issues. Long story short, nothing was wrong with camera and had to find another power source.
I used transmission power on the opposite side of trunk (right side). See here for more info. viewtopic.php?f=37&t=20795&start=10
I only used red/purple line for 12V. Ran the wire from right to left. I used ground terminal on the left side so that I don't have to run black (ground) wire from right to left.
I decided to mount camera to door handle. Ran video and power wires from left side of trunk to hatch back door. It wasn't easy to thread wires through rubber connector.
Taking the hatch back door handle apart was a challenge. I had to drill out screws because they were totally frozen and heads were stripped. Once you remove the hatch back opener switch from door handle, you can mount camera and thread wires behind/inside hatchback door clean.
Camera was from Amazon https://www.amazon.com/gp/product/B005Q ... UTF8&psc=1
Image quality is good. I just saw that price dropped by another $5. Now it's $15.50