[jakobv84]

OK well you're in luck in that it's a pre-2003 so you don't have to deal with MOST (fiber optic system). If you google around (or search the forum) you should be able to find how-to's with wiring diagrams, etc. on how the HU / amplifier should be wired so if I were you I'd redo wiring before spending $$$'s on anything else.