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The Delco Unit has no Input Port from Factory.You need to use a Adapter Harness & Module like the PAC (click) > > H E R E
This will give you a number of solutions using the AUX Button
While it would be best to pull radio & identify the Plugs in the radio, then call PAC, typically the parts you need would be:AUXBOX ModuleABGM12 Harness
As long as you do not have ON-Star or CD Changer
Sorry for the delay.........
Confirmed the AUXBOX Module & ABGM12 Harness will work with OnStar
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