I am having problems with the speakers on the drive side, both front and back. I switched the back speaker and they booth work. The audio system in the car is stock.

 

Where are the balance and the fader adjustments set at?

 

I tried setting those, it did nothing.

 

did nothing? as in the adjustments made no difference regardless of where they were set? changing balance and fader should do something

did you buy the car recently? it is likely the previous owner hacked the wiring. you'll need to inspect to ensure no factory wiring is cut. same with the door - inspect the wiring/speaker.

i don't fully understand the problem. what do you mean by "switched the back speaker" - switched how/with what?