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With an aftermarket radio, compatibility is based on having the correct wiring harness that attaches to the vehicle’s connectors and also the dashboard kit for the vehicle that is designed for the new radio so that it looks neat when installed. Since this is a single DIN radio with a double DIN display, it should work with the trailblazer. The wiring harness will have wires that need to be connected to the aftermarket radio’s wires using wiring or butt connectors. Best Buy should be able to help with this if you are doing the install yourself, otherwise their techs will do it with professional installation service.
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