Rear window problem.

[Andrew Hawn]

I bought a 2003 Chevy Silverado 2500 HD it had a few gremlins been trying to tackle them for a while now but my main concern is this one. Backstory the heater core went out change the heater core but before I did that my rear windows worked it also never said that my doors were open after I change my heater core my rear windows don’t work and it says my doors are always open on the dash. I checked the ground right here up on the a pillar I’ve checked the ground underneath the drivers door on the frame the cab mount one I’ve changed every regulator I’ve changed window switches I’ve checked all my fuses but I’m seriously at a loss can anyone help?thank you.