Re: 2015 Grand Cherokee Summit Rear Lift Gate
I haven't done this on a Jeep, but I've removed this part on a lot of other cars while installing backup cameras. I think most cars are going to be similar.
After you get the interior panel off, you'll most likely see that the panel is held by a combination of 10mm bolts or nuts, and some plastic clips.
I'm guessing that during assembly of the car, probably it's designed so that the clips hold it on well enough so it won't fall off, allowing just one person to do the job. Then the bolts or nuts are added to make it secure.
Also keep in mind that the tail lamps may have been installed before or after the panel----so don't be surprised if removal of the tail lamps is required.
If you can have the new part in your hand before doing the job, it would be really good, because you can look at it and see the screw and clip locations.
TIP: The plastic clips probably weren't really designed to be re-used. If you just pull the panel straight off some of the clips will likely break. Instead, from inside the tailgate, if you look closely you will see that you can squeeze the clips a certain way with a small pliers, and then they'll come right out. (Probably the new panel comes with new clips, but it's always good to try to save at least some of the old clips, in case you accidentally damage one of the new clips.
TIP: Both the interior plastic panel and the new outer panel you'll be installing, are much more brittle and easy to break when cold. Try to leave the car parked in the hot sun before you try to take off that interior panel, or if it's cold outside, run the car with the heater on high for a while.