Lift gate and interior lights

These trucks had a problem with the life gate motor going out which sounds like this is what happens to your car, but to be sure lets check the power and ground to the unit housing. This guide and the wiring diagrams below with the location of the life gate motor.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken