I've actually played with the rear plugs before and noticed that there are 2 things that could be wrong for you - there is a white plug beside a black plug, one of those is the amp/audio. Try resetting it (it's on the left side in the trunk). You will have to unscrew the black plastic peice underneath the floor board on the left side. there are three screws there - you can use a socket wrench. You can also try reseating the plug for the amp, you should be able to get to it without going under floor board in rear. Can't remember, but you might be able to get to the two harnesses as well.

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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2