Benz 190e speakers cut out ?

My rear speakers don't work anymore outta nowhere and im pretty sure they're not blown. I took out the deck to make sure the cables were straight and they are all plugged up at the right spots. I checked the back speakers to and they were all plugged fine. The fader switch (which controls the sound output emphasis from the front or rear) is the only piece that I think could be malfunctioning and halfway broke, since it can still switch the fade. My front right speaker is workin kind of fine and the sub still works.