Guess I'm not too bright. For some reason I thought the HU had to be powered on for the BU camera to work. I would start the truck, turn on the HU, then back up. I was in a parking lot with lots of room so I decided I didn't need the camera. I put it in reverse and lo and behold...the camera came on the screen. Then it dawned on me. Around each **** there is a faint blue light meaning it had power. Standby mode I guess. I just had to shake my head. I amaze myself sometimes.