I've added cargo light kit but my rear cargo light will not turn on. the light on the switch will not come on. Is there somewhere on the truck or in the DIC that I need this switch to be turned on or programmed? I bought the truck used recently so I'm not the first owner. I opened up the dash and checked the wiring to the panel of switches and everything seems ok. I check the fuse and its ok. When I turn on the ignition and then plug the panel of switches back in, the light on the switch comes on and the cargo light and mirror lights come on for about 30 seconds. then everything goes out and never comes back on, unless I go thru this same process again. This is driving my crazy. I don't understand why the switch is not working. Is there a trick with the switch that need to learn? This doesn''t make any sense to me. Can anyone help? 2018 silverado 2500 hd.