I just installed a system in my wife’s 2020 Blazer that does not have have the Bose system. I did not use a T harness, I stripped alittle of the wire coating and soldered 2 female rca ends behind the connector on the radio box under the dash by the right kick panel. If anyone needs wire colors I can post the diagram I found. I have not disabled ANC and it is a problem. I would assume it’s on the box that the speakers plug into. I’d rather not go thru the headliner. Any of y’all that bought a T Harness show what plug or wire affects the ANC or how to disable it?