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2004 chevy trailblazer_ls
1,491 Posts
My vehicle did NOT come with OnStar from the factory, but the wiring is still there, and there is a green plug under the passenger seat, ready to be plugged into the OnStar module.

I believe GM built all TBs as OnStar-capable from a wiring standpoint, although not all got the module.
so that's what that plug is for... :duh:
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