What kind of electrical equipment do you have? A multimeter or continuity tester would help. As long as you can isolate the wires that you know go to the speakers, trial and error is a safe and time consuming way to solve your problem.
I have a multi-meter but what wires would i try to check. Brad thanks for that schematic but that one is for a sable without the "premium" JBL sound but thanks for trying.
