What e3NiNe is saying is to disconnect the right speaker at the speaker itself, not at the back of the head unit. This is very simple to do, and simply involves removing the inner door panels (take out grab tray, door latch, and door light, pop the door off starting at the bottom, keep seperating it to the top, and lift up) and then "unclipping" the speakers and swapping them. If you still don't know what I mean by "unclipping" the speakers, then just unscrew the speaker, and look at the back... it will make sense. Its this or take in in to circuit city and have them charge 60 bucks to do this for ya.

If the left still does not work, examine the wires, and the harness. Unplug the whole harness and make sure the prongs are not bent. As a last case, unplug the individual wires that are not working, and check for voltage. If you arent getting a reading, then its a problem with the internal amp.