i had this problem 5 years back.
mine was the sub woofer.
i think (from memory) the optical cable, after leaving the dashboard (ICM/CD/Minidisc/Phone) goes to the Amp under the drivers seat, then goes up the rear nearside "D" piller from the subwoofer, into the antanae, then back down past the subwoofer onwards to the satnav module.
if it was me - i'd remove the rear inside nearside boot panel - bit of a PITA. Loop out the Sub/Antanae. Ignition off/on. (i think i had to wipe codes with VIDA), then see if that works.
If it does, you can then isolate down to Sub or Antanae. If not, it means its another in the chain.
My money would be on the subwoofer. I ended up looping my old one out as i could not find a replacement (even same part number) which would work in my system.
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