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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 6958988" data-attributes="member: 576029">GM uses the Class II Data Bus so that is why the expensive wiring harness is needed - it retains door chimes, onstar features, and other associated items.  you lose that when you replace the factory head unit - the expensive harness retains those features.if you don't care about those features, then you can just tap the suggested wire at the steering column - which is messy and requires an inline fuse holder (you MUST fuse that connection!!!)the easy way is to get an "add-a-fuse" in one of the fuse boxes.  they are available in any major autoparts store - just get the one that matches your car (ATO or Mini)</blockquote>

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