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Message: <blockquote data-quote="sizzl3r" data-source="post: 8089669" data-attributes="member: 624838">I'm gonna be helping my friend install a system in his 2003 Trailblazer. I've done installs before but he has onstar, and I've heard it can be a pain to bypass...I'd like to keep all the chimes ect in the car. He said if Onstar doesn't work, that's fine. Do I have to buy a special harness or do anything weird to get around this?</blockquote>

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