This is really weird. I just put my stock BOSE headunit back on and like the last time I had the stock BOSE headunit in, the driver side speaker worked, but the passenger side didn't work. WTH? It couldn't be the speakers because both worked when I had an aftermarket headunit in. Now I put the factory BOSE unit back in, one works and the other doesn't. Also, normally when I turn off the car, I leave the stereo as is(i.e.don't turn it off), when I turn the car off, I hear this loud pop from the driver side speaker. I didn't get this popping noise from the driver side speaker when I had the aftermarket unit in. Another is when I turn the BASS button all the way to the left(lowest setting), there would be no sound coming from the driver side speaker at all, like it's off or something. Could someone shed some light on this for me because I'm clueless.

 

check the wires
switch the speakers

do some troubleshooting and let us know what comes up

 

I don't think it's the speakers or the wires. Like I said, everything worked fine with the aftermarket headunit, but once I put the stock BOSE unit back in, the other speaker didn't work.