by CJ » Fri Jan 29, 2010 3:22 pm
You'll need to determine if the wiring or speakers is at fault.
Either your speaker cabling is shot or all speakers are screwed, both fairly unlikely.
Have you got a spare speaker you can use to connect up to one of the channels? (need to break into loom). Alternatively, run a wire from one of the front channels to a one of the existing speakers.
Take a look at the rear speakers from the boot - are they connected up?
CJ