Installing a deck into a car with ONSTAR

[sizzl3r 10+ year member]

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?

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[CrossoverOre 10+ year member]

nothing fancy there. get an interface for gm non onstar and you wont have any problems.