my right rear turn, backup, park and brake lights are not working?

Yep, I think you are correct the ground on the right lower left is not attached or damaged. The ground is at the "lower right C pillar". so you will need to remove trim panels on the right side to find it, they don't give us an image of the exact ground location. Here is the information I have. Check out the images (below). Let us know how it goes

Thank you for the feedback. Didn't find the ground but I confirmed it's good. I have good continuity at lamp assy connector and car frame.

I believe I might not have the right wiring diagram for my car.
See attached picture.
I do have the splice for the ground. It goes to the light assy and to the connector I am holding. But on the other side of the connector, I only have 3 wires going out (Black, white/orange and green).
This does not match what we see on the wiring diagram.

I believe you need the last 8 digit of my VIN to find the proper wiring diagram.
It is HR599473.

The problem started right after I hit the molding under the doors going from front to back wheel. I see some wiring there but nothing that match the colors I see on the light assy.

Any help is very appreciated.

It looks like something non factory has been added to the wiring harness. What does the green wire go to?