Bingo! Finally got it traced out today. Wire goes all the way to the back end and I was able to trace it to what i thought was an "opps button" (blank plug) on the rear bumper. There should be two, but i think somebody crashed into something and ripped out one ultrasonic sensor, so there was just an empty hole.
Without both sensors (or knowing how to operate it, still dont). it was hard to tell what it was doing or trying to do.
Seems I can use one sensor if I tap the display. But will probably replace it, along with the crummy fish eye lens camera. (and several of the taillights)
keeping me busy....
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