I have the same problem except on the drivers side. I jumped in the trunk to check and see if the wire was unplugged or something but there's no visible problem.

I also tried to remove both speakers to swap them, to check whether the problem is with the wiring or the speaker itself. Unfortunately, I can't figure out how to remove them. I found the tabs on them that appear to allow them to lift up for removal through the interior, but I can't budge them. There aren't any screws that I can see so I'm stuck.

Can anyone help?