2003 DB7 Premium Audio rear speakers not working
 

I have a 2003 DB7 Volante with the Becker Traffic Pro and premium radio - for some reason the rear speakers do not function, when I adjust the fade to the rear I just get bass from the center woofer and nothing comes out of the rear speakers. I've attempted to trace the wiring but could use some help with a diagram. A scope shows signal leaving the Becker rear speaker connections. Any help would be appreciated.

Just a note to let you know that I got this resolved. Seems the wires were not connected behind the speakers. Simple enough, but who would have thought. Sounds great with them all working! ----- but getting to them was a bear.