Try looking for an amp in the trunk on the back seat frame. You don't have a Bose, but you might have the Monsoon system. The only designation is on the factory head unit when you turn it on. It says "Monsoon" on the display. There will be a black box on the drivers side of the back seat frame in the trunk that says Monsoon.
Oops. i guess i should read all the threads before i post. LOL. The only thing i could think of is take a 9 volt battery and touch it to the speaker leads at the wiring harness and listen for a pop. if no pop, look for a splice where someone could have added a line level converter. I install high end home audio/video for a living and have a "tone generator" they are 60 bucks of so at Home Depot. you could use it to trace the wire and find the break. I think they have a less expensive one too, called a "cable tracer"
Last edited by Elcamino man; 10-25-2009 at 08:05 PM.
Reason: ignorence on my part