This AXXESS bypass harness is designed to solve common problems for installers adding subwoofers or aftermarket speakers to vehicles with active noise cancellation (ANC). The harness maintains proper communication between audio equipment and the ANC system, giving listeners full control over their music without sound distortion, interference, or conflict between devices. | Metra | | Axxess ANC Bypass Harness for Select 2016-2020 GM and Cadillac Vehicles | Best Buy