Is the connector still in the wire harness in the door panel ?, if GM removed it then there will be no way to power the LED strip. GM removed the LED strip as a cost savings, it makes sense that the connector for the light strip has been removed as well. You will have to buy the harness for each door. In the Diagram it shows the harness (21) is specific to the 2015 LTZ and the Applique (11) shows versions with and without lighting package. The trim in front of the light strip must have the Translucent chrome in it vs Opaque chrome found in the non illuminated versions. it may take more than a simply adding the LED Strip.