I have a 2001 GC. The point is that I have not one, but many electrical issues,
-The passenger window stops recently. Could be the regulator(???)

-The passenger sliding door unlatches but doesn't run. Harness wiring is been checked and it is ok.

-Back lift gate doesn't open. Unlatches, beeps but doesn't run neither.

-Passenger air heater doesn't work.

Battery has been replaced, alternator is good and apparently there are no codes on the scanner. Apparently all fuses are ok.
Note. When I bought the van I had to clean the corroded poles of the old battery. This could have created the mess, but as I said battery is been replaced.

I think that perhaps the body controller has to be reflashed/reprogrammed? ...or perhaps there's a shortcut in the rear hatch lift door gate. As can be seen, they might be a problem underneath.

Thanks for your advise

 

Welcome to the forum, it sure would be nice if one thing could fix it all but no such luck.
The passenger side window is most likely the window motor. I put in the entire regulator assembly, pretty close to the same money and if you've ever tried replacing just the motor, you'd do the regulator too.
I am going to assume the passenge sliding door is power and when you hit the button to open it, the latch releases the door but it doesn't power open. I would recommend you recheck the harness, that is the problem 98% of the time. Otherwise you will need a scan tool to see what sensor is messing up.
Rear hatch, does it sound like the motor is running? There was an issue with the actuator that moved the gear into the motor, also an issue where the hatch would release and relatch before the motor engaged.
Passenger side no heat, does the drivers side heat well? There was an issue with the shaft to the passenger side blend door being too short so it would come out of the motor or the door and stop moving.
Hope some of this helped, good luck!