Fuck it all off and just get a new head-unit. Seriously - too much hassle, why bother? A pretty decent head unit is 200-300, you will get features which are actually in this era and you can stop trying to make things work from the stone age.

Spend ~$1k or so and you can get a entry level new system throughout.

Drop it off at a reputable audio shop and tell them to take care of it and tell them how much you can spend.

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[SIGPIC][/SIGPIC]
Should have bought an STI