Thanks fellas, my rear cargo lights work now though I'm not entirely certain what I did! My problem has been that I would open the liftgate and the white lights on the gate itself and right-rear of the cargo have never turned on. OK so the 3rd row seat is down and I see a light above the deck so I crawl up there and push a button and that light comes on. Still no cargo lights. Then I open the driver door and no interior lights. Found the "interior function" switch and nothing. OK put vehicle in accessory mode and fiddle some more, including pushing a button which looks like the "Rear Interior Lamps" icon Left Coast Geek showed me. Open and close the driver door and turn off Accessory mode and voila EVERYTHING APPEARS NOW TO WORK i.e. all the buttons and accent lights and white lights including the cargo area which honestly I have never seen lit before.
Probably the lamp button front-and-rear will turn off the white lights and leave the ambient alone but for now I'll take full bright everywhere! Thanks again!