Rear speaker not working

I've got a 2002 GMC Envoy and the rear driver's side speaker just stopped working a couple of weeks ago. I checked the speaker itself and it does work, but when I connect it back up to the wire in the vehicle, it doesn't work. All the other speakers work just fine and I have no problems with the head unit. Any and all idea as to what this could be would be greatly appreciated.Ariel

check the wires in the back of the deck, that was a problem i had. if its not that, check your fade settings, or else it might be the wiring between the deck and the speakers, although i dont know how those would have gotten affected.

is this a factory stereo, or something you had put in ?